diff --git a/src/baekjoon/B23925.java b/src/baekjoon/B23925.java
new file mode 100644
index 0000000..1b82a3f
--- /dev/null
+++ b/src/baekjoon/B23925.java
@@ -0,0 +1,38 @@
+package baekjoon;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class B23925 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int testCase = Integer.parseInt(br.readLine());
+
+
+        for(int i = 1 ; i <=testCase;i++){
+            StringTokenizer st = new StringTokenizer(br.readLine());
+
+            long n = Long.parseLong(st.nextToken());
+
+            long k = Long.parseLong(st.nextToken());
+
+            long s = Long.parseLong(st.nextToken());
+
+            long reset = k + n;
+
+            long back = k+(k-s) + (n-s);
+
+            sb.append(String.format("Case #%d: %d",i, Math.min(reset, back))).append("\n");
+        }
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B10214.java b/src/baekjoon/bronze/B10214.java
new file mode 100644
index 0000000..cf3e5a8
--- /dev/null
+++ b/src/baekjoon/bronze/B10214.java
@@ -0,0 +1,47 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B10214 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+
+        int testCase = Integer.parseInt(br.readLine());
+
+
+        while(testCase-->0){
+
+            int kr = 0;
+            int ys = 0;
+
+            for(int i = 0 ; i<9;i++){
+                int[] input = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+                ys += input[0];
+
+                kr += input[1];
+
+
+            }
+            if(ys>kr){
+                sb.append("Yonsei").append("\n");
+            }else if(kr==ys){
+                sb.append("Draw").append("\n");
+            }else{
+                sb.append("Korea").append("\n");
+            }
+
+        }
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B11283.java b/src/baekjoon/bronze/B11283.java
new file mode 100644
index 0000000..e684ab0
--- /dev/null
+++ b/src/baekjoon/bronze/B11283.java
@@ -0,0 +1,24 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B11283 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        char input = br.readLine().charAt(0);
+
+        sb.append(input-'가'+1);
+
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B14039.java b/src/baekjoon/bronze/B14039.java
new file mode 100644
index 0000000..bb4add2
--- /dev/null
+++ b/src/baekjoon/bronze/B14039.java
@@ -0,0 +1,52 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B14039 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] rows = new int[4];
+
+        int[] cols = new int[4];
+
+        for(int i = 0; i<4;i++){
+            int[] inputs = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+            for(int j = 0;j<4;j++){
+                rows[i] += inputs[j];
+                cols[j] += inputs[j];
+            }
+        }
+
+        int magic = rows[0];
+
+        boolean isMasic = true;
+
+        for(int i = 0;i<4;i++){
+            if(magic!=rows[i]){
+                isMasic = false;
+            }
+
+            if(magic!=cols[i]){
+                isMasic =false;
+            }
+        }
+
+        if(isMasic){
+            sb.append("magic");
+        }else{
+            sb.append("not magic");
+        }
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B14625.java b/src/baekjoon/bronze/B14625.java
new file mode 100644
index 0000000..959dff8
--- /dev/null
+++ b/src/baekjoon/bronze/B14625.java
@@ -0,0 +1,60 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B14625 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] input = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+        int startH = input[0];
+        int startM = input[1];
+
+        input = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+        int endH = input[0];
+        int endM = input[1];
+
+        String want = br.readLine();
+
+
+        int nowH = startH;
+        int nowM = startM;
+
+        int result = 0;
+        while(true){
+
+
+            String now = String.format("%02d%02d",nowH,nowM);
+
+
+            if(now.contains(want)){
+                result++;
+            }
+
+            if(nowH==endH&&nowM==endM){
+                break;
+            }
+
+            nowM++;
+
+            if(nowM==60){
+                nowM=0;
+                nowH++;
+            }
+
+        }
+
+        sb.append(result);
+
+        System.out.print(sb);
+    }
+}
diff --git a/src/baekjoon/bronze/B16625.java b/src/baekjoon/bronze/B16625.java
new file mode 100644
index 0000000..f959662
--- /dev/null
+++ b/src/baekjoon/bronze/B16625.java
@@ -0,0 +1,42 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.Scanner;
+
+public class B16625 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args){
+
+        Scanner scan = new Scanner(System.in);
+
+        int p = scan.nextInt();
+
+        int q = scan.nextInt();
+
+        int s = scan.nextInt();
+
+        boolean is = false;
+        if(p*q<=s){
+            is=true;
+        }else{
+            int min = Math.min(p,q);
+
+            for(int i = min;i<=s;i++){
+                if(i%p==0&&i%q==0){
+                    is=true;
+                    break;
+                }
+            }
+        }
+
+        sb.append(is?"yes":"no");
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B17283.java b/src/baekjoon/bronze/B17283.java
new file mode 100644
index 0000000..ba1fa1f
--- /dev/null
+++ b/src/baekjoon/bronze/B17283.java
@@ -0,0 +1,35 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B17283 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int input = Integer.parseInt(br.readLine());
+
+        int rate = Integer.parseInt(br.readLine());
+
+        int result = 0;
+
+        int col=2;
+
+        while(input>5){
+            int row = input * rate /100;
+
+            if(row <=5) break;
+
+            result += row * col;
+            col *=2;
+
+            input = row;
+        }
+        sb.append(result);
+        System.out.print(sb);
+    }
+}
diff --git a/src/baekjoon/bronze/B18868.java b/src/baekjoon/bronze/B18868.java
new file mode 100644
index 0000000..2a3d990
--- /dev/null
+++ b/src/baekjoon/bronze/B18868.java
@@ -0,0 +1,64 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Set;
+import java.util.StringTokenizer;
+
+public class B18868 {
+    public static void main(String[] args) throws Exception {
+
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        int n = Integer.parseInt(st.nextToken());
+        int m = Integer.parseInt(st.nextToken());
+
+        int[][] spaces = new int[n][m];
+
+        for(int i=0;i<n;i++){
+            st = new StringTokenizer(br.readLine());
+            for(int j=0;j<m;j++){
+                spaces[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        HashMap<String,Integer> map = new HashMap<>();
+
+        for(int i=0;i<n;i++){
+
+            int[] arr = spaces[i].clone();
+            int[] sorted = arr.clone();
+            Arrays.sort(sorted);
+
+            HashMap<Integer,Integer> rank = new HashMap<>();
+
+            int r=0;
+            for(int v : sorted){
+                if(!rank.containsKey(v)){
+                    rank.put(v,r++);
+                }
+            }
+
+            StringBuilder sb = new StringBuilder();
+
+            for(int j=0;j<m;j++){
+                sb.append(rank.get(arr[j])).append(",");
+            }
+
+            String key = sb.toString();
+            map.put(key,map.getOrDefault(key,0)+1);
+        }
+
+        int result = 0;
+
+        for(int v : map.values()){
+            result += v*(v-1)/2;
+        }
+
+        System.out.println(result);
+    }
+}
diff --git a/src/baekjoon/bronze/B20233.java b/src/baekjoon/bronze/B20233.java
new file mode 100644
index 0000000..801ebb8
--- /dev/null
+++ b/src/baekjoon/bronze/B20233.java
@@ -0,0 +1,40 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B20233 {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+        int a = Integer.parseInt(br.readLine());
+
+        int x = Integer.parseInt(br.readLine());
+
+        int b = Integer.parseInt(br.readLine());
+
+        int y = Integer.parseInt(br.readLine());
+
+        int useed = Integer.parseInt(br.readLine());
+
+        int aResult = ((useed - 30) * x);
+
+        int bResult = ((useed - 45) * y);
+
+        if(aResult<0){
+            aResult = 0;
+        }
+        if(bResult <0){
+            bResult = 0;
+        }
+        sb.append(a+aResult*21).append(" ").append(b+bResult*21);
+
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B20651.java b/src/baekjoon/bronze/B20651.java
new file mode 100644
index 0000000..e498fd9
--- /dev/null
+++ b/src/baekjoon/bronze/B20651.java
@@ -0,0 +1,42 @@
+package baekjoon.bronze;
+
+import java.util.Scanner;
+
+public class B20651 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int[] flowers = new int[n];
+        for (int i = 0; i < n; i++) {
+            flowers[i] = sc.nextInt();
+        }
+
+        int count = 0;
+        // 1. 모든 연속된 부분 수열(i부터 j까지) 선정
+        for (int i = 0; i < n; i++) {
+            for (int j = i; j < n; j++) {
+                int sum = 0;
+                for (int k = i; k <= j; k++) {
+                    sum += flowers[k];
+                }
+
+                // 부분 수열의 길이
+                int len = j - i + 1;
+
+                // 2. 평균값이 정수인지 확인 (합이 길이로 나누어 떨어져야 함)
+                if (sum % len == 0) {
+                    int average = sum / len;
+
+                    // 3. 평균값이 부분 수열에 포함되는지 확인
+                    for (int k = i; k <= j; k++) {
+                        if (flowers[k] == average) {
+                            count++;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+        System.out.println(count);
+    }
+}
\ No newline at end of file
diff --git a/src/baekjoon/bronze/B24900.java b/src/baekjoon/bronze/B24900.java
new file mode 100644
index 0000000..dc834aa
--- /dev/null
+++ b/src/baekjoon/bronze/B24900.java
@@ -0,0 +1,78 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B24900 {
+    static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    public static void main(String[] args) throws IOException {
+
+        System.out.println("                                                           :8DDDDDDDDDDDDDD$.                                           \n" +
+            "                                                      DDDNNN8~~~~~~~~~~=~7DNNDNDDDNNI                                   \n" +
+            "                                                  ?NNDD=~=~~~~~~~~~~~~~~~~~=~~==~=INNDNN7                               \n" +
+            "                                               +NDDI~~~~~~~~~~~~~~~~~~~~~~~=~~========~ODND+                            \n" +
+            "                                            :NND~~~~~~~~~~~~~~~~~~~~~~~~~~~=~~============7NDN                          \n" +
+            "                                          $DD$~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=~~==============~DNN                        \n" +
+            "                                        $DD=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=~~=================NND                      \n" +
+            "                                       ND7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=~~===================DD7                    \n" +
+            "                                     ~DD=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=======================8DN.                  \n" +
+            "                                    8DO~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=========================DD                  \n" +
+            "                                   8N~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=~~=======================DN                 \n" +
+            "                                  NN::::::::~~~~~~~~~~~=~~~~~~~~~~~~~~~~~~~=~~========================DDO               \n" +
+            "                                 $D$:::::::::::::::~~~~DD~~~~~~~~~~~~~~~~~~=~~=========================DN.              \n" +
+            "                                 D8:::::::::::::::::::DN=::~~~~~~~~~~~~~~~~=~~======================~~:~DN              \n" +
+            "                                DN:::::::::::::::::::ONO::::::::::::::::::::~~~~~~~~~~~~:::::::::::::::::DN             \n" +
+            "                               DN::::::::::::::::::::NN.:::::::::::::::::::::::::::DN::::::::::::::::::::$DO            \n" +
+            "                               DD:::::::::::::::::::DNI:::::::::::::::::::::::::::::D=::::::::::::::::::::NN            \n" +
+            "                              NN~~~~:::::$N?:::::::.NN::::::::::::::::::::::::::::::ND.:::::::::::::::::::+N8           \n" +
+            "                              N7~~~~~~~~OD7::::::::~DD::::::::::::::::::::::::::::::~D$::::::::::::::::::::DN           \n" +
+            "                             NN~~~~~~~~IDZ~~~~~::::DN~:::::::::::::::::::::::::::::::DN::::::::::::::::::::=N~          \n" +
+            "                             DD~~~~~~~~NN~~~~~~~~~=NN::::::::::::::::::::::::::::::::DN:::::::::::::::~~====NN          \n" +
+            "                            8D~~~~~~~~ND~~~~~~~~~~~ND~~~~~~~~:::::::::::::::::::::::::N7:::~~===============NN          \n" +
+            "                            DD~~~~~~~ON+~~~~~~~~~~~ND~~~~~~~~~~~~~~~~~~~=+NZ==========NN====================~ND         \n" +
+            "               :DD7   DNDD. N8~~~~~~~NN~~~~~~~~~~DDND~~~~~~~~~~~~~~~~~~~~ND~~=========DD=====================ND         \n" +
+            "               N~:DDNNN .8NDN~~~~~~~$D=~~~~~~~~+ND.DD~~~~~~~~~~~~~~~~~~~=DD~~=========~D+====================DN         \n" +
+            "              :D     .  ..~ND~~~~~~~NN~~~~~~~+NN$..ND~~~~~~~~~~~~~~~~~~~7N=~~=========~ND=======~============ON         \n" +
+            "              NN       ...:N?~~~~~~~N=~~~~~NNNI.. .7D+~~~~~~~~~~~~~~~~~=8NN~~==========NN=======N============$N         \n" +
+            "         N  ODN       ....DN~~~~~~~DD=8NNND$..     .DD~~~=~~~~~~~~~~~~~=NNDD=~=========8D~======NN===========~N$        \n" +
+            "    N? =NN  ND      .....NND~~~~~~~DDNN:...        .ND=~DNN~~~~~~~~~~~~=DN.DN~=========?N+======NN============ND        \n" +
+            "   $D? DN    DZ    ....ND8NN~~~~~~$D                .DD~NNDD~~~~~~~~~~~~D8..DN=========~DN======NN============DN        \n" +
+            "   DN ~N~   NN    ..:~NN..NZ~~~~~~DN                  NNN8.ND~~~~NDN?~~~DZ...7DD=======~NN======NN============DN        \n" +
+            "   ND DD    :DN.  ..ND$  .N?~~~~~=NNN                   . ..DDD$~N8OND8=N+   ..DDDZ~====NN======+D+===========ND        \n" +
+            "   NO         DD  ZDN    8NO~~~~~~NNN..DDDNN7               ...NND...:DDD:     .:.NDND=~DD======~DO===========DN        \n" +
+            "              DNDDN:.    DN~~~~~~=NNNN.ODNNNNDDNNO              ...     .         ...DNNNN=======ND===========DD        \n" +
+            "       INDN7    DD.     .DD~~~~~=IDND:.:~.....?DNDNN.                        ...... ....$D=======ND===========ND        \n" +
+            "       NN        ND.    8N=~~~~$ND::.:=~:.~=......=ND~                 .NNNNNNNNNNNNNNN.~N+======NN===========DN        \n" +
+            "       $DD        DN:   DD~~~~7NO...~==.:~~:.....                      NNNND? ..::..7NZ.:N?======8D~==========ZN        \n" +
+            "       DN?     ~D: DND.?D~~~~~DD....~:.~=~.......                            ....~=:.:~..ND======~N$==========~DO       \n" +
+            "       ND    ..DD.  .DNDN=~~~~DI.......:.........                           ....=~..~~~..DN======~DD===========NN       \n" +
+            "       DDD  :.:DD.  . DDI~~~~~ND................        .DNNNNNNNNNN7      ....=~:.:~~...NN=======ND===========?D~      \n" +
+            "       8D. ...OD..    DD~~~~~~+ND ............          NN:~::::~~~8N      ........~~...:ND=======DN============NN      \n" +
+            "       DDI:...ND     .D7~~~~~~~7NN ..........           ID8::::::::8D      .............:DN=======ON============NN      \n" +
+            "        ~NNND.N=.   .NN~~~~~~~~~NDN8                       ~::::::~N8       .............DN========D=============NI     \n" +
+            "               DDNNN.ND~~~~~~~~DD =DND                                       ............DN========N+~===========NN     \n" +
+            "                   ~:N=~~~~~~~~DD   .DDDD                                       ........ NN========DD============8D     \n" +
+            "                    8N~~~~~~~~~ND    . .7NDDD? .                                      .8DDN========NN=============D:    \n" +
+            "                    DD~~~~~~~~~DND:         IDNNND$.                           .+DNNNNDNIDN========DD=============DD    \n" +
+            "                    ND~~~~~~~~ZN 7DD .. .:DDNDDNNDNNNNDDNDND8$?===+$8DDNNNDDDDDN8I~DN====8N========NN=============NN    \n" +
+            "                    DD~~~~~~~~8N   DD.  .NN~~~~.~~=DNDNO.:7ODDDDNNDD8DDDND=~~~ =~~~ON====8N========DN=============DN    \n" +
+            "                    ND~~~~~~~~DN    ZDD  DN~~~ ~~~~~=.7DDD+.......8NNN==~~~~~ ~~~~~ONN$==DN========8N=============ON    \n" +
+            "                    ND~8N~=~~~ZN      DDODN=~.~~~~~=.~~~~INDNNNNDNN~~~~~~~~:~~~~~~~DN~ND=DN========DD=========~ND=8N    \n" +
+            "                    IN=NDDI~~~~D8       DNN::~~~~~.~~~~~=.~~ND~~ND~~~~~~~~.~~~~~~~~NN  NDNN====ND==ND~D?======DNN=ND    \n" +
+            "                     DNNI8ND=~~DN:       ZN=~~~~~ ~~~~~.~~~~DD~=DD~~~~~~~ ~~~~~~~=.ND. . ND===DNDD=NDDNN=====8NZDDDN    \n" +
+            "                      NND  IDNDNNN+       D+~~~:~~~~~~ ~~~~~DDNNN+~~~~~~~~~~~~~~:=?N7   .ND=~ND  DNNN~ID====ND7 NNN     \n" +
+            "                       ID                 ND~~ ~~~~~:.~~~7DDN7IDNN==~~ ~~~~~~~~ ~~DN   .:N?DDDDD NND  8N~=DDD  ZNN      \n" +
+            "                                          NN~:~~~~~ =7DDDD+8N  :N8DDZ.~~~~~~~~.~~~DD.   NDD+ . DN=     OND+             \n" +
+            "                                          DND~~~=8DNDDZ=~~ ND   NN~INND~~~~~.~~~~ND .    .    ..IDD                     \n" +
+            "                                         DDNNNDNNN+~~~~~~.7N.    ND~~~NDDI~ ~~~~=NNN             .DDI                   \n" +
+            "                                        DN=~~~~.=~~~~~~ ~~DN     +N+~~~~+DNDD~~~NNNND.            ..ND                  \n" +
+            "                                         DDI~~ ~~~~~~~ ~~~ND..  ..ND~~~~:~~~DNDNNNN+            ..7O8ND+                \n" +
+            "                                          .DND=~~~~=::~~=NN.   . . 8D~~.~~~~~~=DN$ODNDNDNNNDNNNNND8+~..                 \n" +
+            "                                             8DNNI=.~~~~=NDDNNNNDDNDNN.~~~~~IDDNDND7:.                                  \n" +
+            "                                                ?DNNDD?~DD          ~NN~~=NDD$                                          \n" +
+            "                                                     :DDD.            NNNN=                                             ");
+    }
+
+}
\ No newline at end of file
diff --git a/src/baekjoon/bronze/B25372.java b/src/baekjoon/bronze/B25372.java
new file mode 100644
index 0000000..eab9993
--- /dev/null
+++ b/src/baekjoon/bronze/B25372.java
@@ -0,0 +1,33 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B25372 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int testCase = Integer.parseInt(br.readLine());
+
+        for(int i=0;i<testCase;i++){
+            String input = br.readLine();
+
+            int leng = input.length();
+
+            if(leng>=6&&leng<=9){
+                sb.append("yes").append("\n");
+            }else{
+                sb.append("no").append("\n");
+            }
+        }
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B27389.java b/src/baekjoon/bronze/B27389.java
new file mode 100644
index 0000000..2852dbc
--- /dev/null
+++ b/src/baekjoon/bronze/B27389.java
@@ -0,0 +1,24 @@
+package baekjoon.bronze;
+
+import java.awt.SystemTray;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Scanner;
+
+public class B27389 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+        Scanner scan = new Scanner(System.in);
+
+        double input = scan.nextDouble();
+
+        sb.append(String.format("%.2f",input/4));
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B27434.java b/src/baekjoon/bronze/B27434.java
new file mode 100644
index 0000000..5a250b9
--- /dev/null
+++ b/src/baekjoon/bronze/B27434.java
@@ -0,0 +1,31 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.math.BigInteger;
+
+public class B27434 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+
+    public static void main(String[] args) throws NumberFormatException, IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+        br.close();
+
+        System.out.println(factorial(1, N));
+    }
+
+    public static BigInteger factorial(int a, int n) {
+        BigInteger num = BigInteger.valueOf(a);
+        if (a < n) {
+            int b = (a + n) / 2;
+            num = factorial(a, b).multiply(factorial(b + 1, n));
+        }
+        return num;
+    }
+}
diff --git a/src/baekjoon/bronze/B30402.java b/src/baekjoon/bronze/B30402.java
new file mode 100644
index 0000000..141f91b
--- /dev/null
+++ b/src/baekjoon/bronze/B30402.java
@@ -0,0 +1,32 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B30402 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        while(true){
+            String input = br.readLine();
+
+            if(input.contains("w")){
+                sb.append("chunbae");
+                break;
+            }else if(input.contains("g")){
+                sb.append("yeongcheol");
+                break;
+            }else if(input.contains("b")){
+                sb.append("nabi");
+                break;
+            }
+        }
+
+        System.out.print(sb);
+    }
+}
diff --git a/src/baekjoon/bronze/B30617.java b/src/baekjoon/bronze/B30617.java
new file mode 100644
index 0000000..c80bfaa
--- /dev/null
+++ b/src/baekjoon/bronze/B30617.java
@@ -0,0 +1,47 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B30617 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int t = Integer.parseInt(br.readLine());
+
+        int[] input;
+
+        int preL=0;
+        int preR=0;
+
+        int result =0;
+
+        while(t-->0){
+            input = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+            int L = input[0];
+            int R = input[1];
+            if(preR!=0&&R==preR){
+                result++;
+            }
+            if(preL!=0&&L==preL){
+                result++;
+            }
+            if(L!=0&&L==R){
+                result++;
+            }
+            preL =L ;
+            preR = R;
+        }
+
+        sb.append(result);
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/bronze/B31403.java b/src/baekjoon/bronze/B31403.java
new file mode 100644
index 0000000..fd00d33
--- /dev/null
+++ b/src/baekjoon/bronze/B31403.java
@@ -0,0 +1,29 @@
+package baekjoon.bronze;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+
+public class B31403 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+        String a = br.readLine();
+        String b = br.readLine();
+        String c = br.readLine();
+
+        int aI = Integer.parseInt(a);
+        int bI = Integer.parseInt(b);
+        int cI = Integer.parseInt(c);
+
+        sb.append(aI+bI-cI).append("\n");
+        sb.append(Integer.parseInt(a+b)-cI);
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B31668.java b/src/baekjoon/bronze/B31668.java
new file mode 100644
index 0000000..c18e7f2
--- /dev/null
+++ b/src/baekjoon/bronze/B31668.java
@@ -0,0 +1,28 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B31668 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int n = Integer.parseInt(br.readLine());
+
+        int m = Integer.parseInt(br.readLine());
+
+        int k = Integer.parseInt(br.readLine());
+
+        sb.append((m/n)*k);
+
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B32626.java b/src/baekjoon/bronze/B32626.java
new file mode 100644
index 0000000..3d14b05
--- /dev/null
+++ b/src/baekjoon/bronze/B32626.java
@@ -0,0 +1,67 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B32626 {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        long[][] inputs = new long[3][2];
+
+        for(int i = 0 ; i < 3;i++){
+
+            long[] input = Arrays.stream(br.readLine().split(" ")).mapToLong(Long::parseLong).toArray();
+
+            for(int j=0;j<2;j++){
+                inputs[i][j] = input[j];
+            }
+        }
+
+        long Sx = inputs[0][0];
+        long Sy = inputs[0][1];
+        long Ex = inputs[1][0], Ey = inputs[1][1];
+        long Px = inputs[2][0], Py = inputs[2][1];
+
+// 1. 같은 x (세로)
+        if (Sx == Ex) {
+            if (Px == Sx && Math.min(Sy, Ey) < Py && Py < Math.max(Sy, Ey)) {
+                System.out.println(2);
+            } else {
+                System.out.println(0);
+            }
+        }
+
+// 2. 같은 y (가로)
+        else if (Sy == Ey) {
+            if (Py == Sy && Math.min(Sx, Ex) < Px && Px < Math.max(Sx, Ex)) {
+                System.out.println(2);
+            } else {
+                System.out.println(0);
+            }
+        }
+
+// 3. 꺾는 경우
+        else {
+            // 경로1: 가로 → 세로
+            boolean path1 = true;
+            if (Py == Sy && Math.min(Sx, Ex) < Px && Px < Math.max(Sx, Ex)) path1 = false;
+            if (Px == Ex && Math.min(Sy, Ey) < Py && Py < Math.max(Sy, Ey)) path1 = false;
+
+            // 경로2: 세로 → 가로
+            boolean path2 = true;
+            if (Px == Sx && Math.min(Sy, Ey) < Py && Py < Math.max(Sy, Ey)) path2 = false;
+            if (Py == Ey && Math.min(Sx, Ex) < Px && Px < Math.max(Sx, Ex)) path2 = false;
+
+            if (path1 || path2) System.out.println(1);
+            else System.out.println(2);
+        }
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B34823.java b/src/baekjoon/bronze/B34823.java
new file mode 100644
index 0000000..8c8d03f
--- /dev/null
+++ b/src/baekjoon/bronze/B34823.java
@@ -0,0 +1,33 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B34823 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] inputs = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+        int y = inputs[0];
+
+        int c = inputs[1];
+
+        int p = inputs[2];
+
+        int result=Math.min(Math.min(y,p),c/2);
+
+
+        sb.append(result);
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B6190.java b/src/baekjoon/bronze/B6190.java
new file mode 100644
index 0000000..d2c7981
--- /dev/null
+++ b/src/baekjoon/bronze/B6190.java
@@ -0,0 +1,33 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class B6190 {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        long n = Long.parseLong(br.readLine());
+
+        int result = 0;
+
+        while(n!=1){
+            if(n%2==0){
+                n/=2;
+            }else{
+                n= 3*n+1;
+            }
+            result++;
+        }
+
+        sb.append(result);
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/bronze/B8949.java b/src/baekjoon/bronze/B8949.java
new file mode 100644
index 0000000..b997a2b
--- /dev/null
+++ b/src/baekjoon/bronze/B8949.java
@@ -0,0 +1,76 @@
+package baekjoon.bronze;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B8949 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+
+        String[] inputs = br.readLine().split(" ");
+
+        int str1Len = inputs[0].length()-1;
+
+        int str2Len = inputs[1].length()-1;
+
+
+        boolean maxStr = str1Len>str2Len;
+
+        int maxStrLen;
+
+        int minStrLen;
+
+        String shortStr = "";
+
+        String longStr = "";
+        if(maxStr){
+            maxStrLen = str1Len;
+
+            minStrLen = str2Len;
+
+            shortStr = inputs[1];
+
+            longStr = inputs[0];
+        }else{
+            maxStrLen = str2Len;
+
+            minStrLen = str1Len;
+
+            shortStr = inputs[0];
+
+            longStr = inputs[1];
+        }
+
+        while(maxStrLen>=0){
+            int shortNum;
+            int longNum;
+
+            if(minStrLen >= 0){
+                shortNum = shortStr.charAt(minStrLen--)-'0';
+            }else{
+                shortNum = 0;
+            }
+
+            longNum = longStr.charAt(maxStrLen--)-'0';
+
+            int temp = shortNum + longNum;
+
+            sb.insert(0,temp);
+
+        }
+
+
+
+
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/class5/B21603.java b/src/baekjoon/class5/B21603.java
new file mode 100644
index 0000000..2e6b69e
--- /dev/null
+++ b/src/baekjoon/class5/B21603.java
@@ -0,0 +1,47 @@
+package baekjoon.class5;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B21603 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] input = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+        int N = input[0];
+
+        int K = input[1];
+
+        int K2 = K*2;
+
+        int fk = K%10;
+
+        int fk2 = K2%10;
+
+        int result = 0;
+        for(int i = 1;i<=N;i++){
+            if(i%10==fk||i%10==fk2){
+                continue;
+            }else{
+                result++;
+                sb.append(i).append(" ");
+            }
+        }
+
+
+        sb.insert(0,result+"\n");
+
+
+
+        System.out.print(sb);
+    }
+
+
+}
diff --git a/src/baekjoon/class5/B2166.java b/src/baekjoon/class5/B2166.java
new file mode 100644
index 0000000..d2d359d
--- /dev/null
+++ b/src/baekjoon/class5/B2166.java
@@ -0,0 +1,56 @@
+package baekjoon.class5;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B2166 {
+
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int n = Integer.parseInt(br.readLine())+1;
+
+        long[] px = new long[n];
+
+        long[] py = new long[n];
+
+        int[] inputs;
+
+        //입력
+        for(int i= 0 ;i<n-1;i++){
+            inputs = Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
+
+            px[i] = inputs[0];
+
+            py[i] = inputs[1];
+        }
+
+        px[n-1] = px[0];
+
+        py[n-1] = py[0];
+
+        long result=0;
+
+        for(int i=0;i<n;i++){
+            int now = i;
+
+            int next = (i+1)%n;
+
+
+            result += (px[now] * py[next]) - (py[now] * px[next]);
+
+        }
+
+        result = Math.abs(result);
+
+        sb.append(String.format("%.1f",result/2.0));
+
+        System.out.print(sb);
+    }
+
+}
diff --git a/src/baekjoon/silver/B1024.java b/src/baekjoon/silver/B1024.java
new file mode 100644
index 0000000..3a769ec
--- /dev/null
+++ b/src/baekjoon/silver/B1024.java
@@ -0,0 +1,43 @@
+package baekjoon.silver;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B1024 {
+
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        long[] inputs = Arrays.stream(br.readLine().split(" "))
+            .mapToLong(Long::parseLong)
+            .toArray();
+
+        long N = inputs[0];
+        long L = inputs[1];
+
+        for (long k = L; k <= 100; k++) {
+
+            long temp = N - (k * (k - 1) / 2);
+
+            if (temp < 0) break;
+
+            if (temp % k == 0) {
+                long x = temp / k;
+
+                if (x >= 0) {
+                    for (long i = 0; i < k; i++) {
+                        sb.append(x + i).append(" ");
+                    }
+                    System.out.print(sb);
+                    return;
+                }
+            }
+        }
+
+        System.out.print(-1);
+    }
+}
\ No newline at end of file
diff --git a/src/baekjoon/silver/B2167.java b/src/baekjoon/silver/B2167.java
new file mode 100644
index 0000000..8332a3c
--- /dev/null
+++ b/src/baekjoon/silver/B2167.java
@@ -0,0 +1,58 @@
+package baekjoon.silver;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B2167 {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] inputs = inputIntArray(br.readLine());
+
+        int col = inputs[0];
+        int row = inputs[1];
+
+        int[][] array = new int[col][row];
+
+        for(int i= 0;i<col;i++){
+            inputs = inputIntArray(br.readLine());
+            for(int j = 0 ; j<row;j++){
+                array[i][j] = inputs[j];
+            }
+        }
+
+        int testCase = Integer.parseInt(br.readLine());
+
+        while(testCase-->0){
+            inputs = inputIntArray(br.readLine());
+
+            long result = 0;
+            int N = inputs[0]-1;
+            int M = inputs[1]-1;
+
+            int X = inputs[2]-1;
+            int Y = inputs[3]-1;
+
+            for(int i = N;i<=X;i++){
+                for(int j = M ; j<=Y;j++){
+                    result += array[i][j];
+                }
+            }
+            sb.append(result).append("\n");
+        }
+
+
+        System.out.print(sb);
+    }
+
+    static int[] inputIntArray(String input) throws IOException {
+        return Arrays.stream(input.split(" ")).mapToInt(Integer::parseInt).toArray();
+    }
+
+
+}
diff --git a/src/baekjoon/silver/B2167_2.java b/src/baekjoon/silver/B2167_2.java
new file mode 100644
index 0000000..a59e0f0
--- /dev/null
+++ b/src/baekjoon/silver/B2167_2.java
@@ -0,0 +1,63 @@
+package baekjoon.silver;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+
+public class B2167_2 {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    private static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int[] inputs = inputIntArray(br.readLine());
+
+        int col = inputs[0];
+        int row = inputs[1];
+
+        int[][] array = new int[col+1][row+1];
+        int[][] dp = new int[col+1][row+1];
+
+        //입력
+        for(int i= 1;i<=col;i++){
+            inputs = inputIntArray(br.readLine());
+            for(int j = 1 ; j<=row;j++){
+                array[i][j] = inputs[j-1];
+            }
+        }
+
+        //누적합 구하기
+        for(int i = 1; i<=col;i++){
+            for(int j = 1 ; j<=row;j++){
+                dp[i][j] = dp[i-1][j] + dp[i][j-1] - dp[i-1][j-1] + array[i][j];
+            }
+        }
+
+        int testCase = Integer.parseInt(br.readLine());
+
+        while(testCase-->0){
+            inputs = inputIntArray(br.readLine());
+
+            long result = 0;
+            int N = inputs[0];
+            int M = inputs[1];
+
+            int X = inputs[2];
+            int Y = inputs[3];
+
+            result = dp[X][Y] - dp[N-1][Y] - dp[X][M-1] + dp[N-1][M-1];
+
+            sb.append(result).append("\n");
+        }
+
+        System.out.print(sb);
+    }
+
+    static int[] inputIntArray(String input) throws IOException {
+        return Arrays.stream(input.split(" ")).mapToInt(Integer::parseInt).toArray();
+    }
+
+
+}
diff --git a/src/baekjoon/silver/B27964.java b/src/baekjoon/silver/B27964.java
new file mode 100644
index 0000000..d3e922e
--- /dev/null
+++ b/src/baekjoon/silver/B27964.java
@@ -0,0 +1,38 @@
+package baekjoon.silver;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.HashSet;
+import java.util.Set;
+
+public class B27964 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    static StringBuilder sb = new StringBuilder();
+
+    public static void main(String[] args) throws IOException {
+
+        int n = Integer.parseInt(br.readLine());
+
+        String[] inputs = br.readLine().split(" ");
+
+        Set<String> cheeses = new HashSet<>();
+
+        for(String cheese : inputs){
+            if(cheese.endsWith("Cheese")){
+                cheeses.add(cheese);
+            }
+        }
+
+        if(cheeses.size()>=4){
+            sb.append("yummy");
+        }else{
+            sb.append("sad");
+        }
+
+
+        System.out.print(sb);
+    }
+
+}