import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.IOException;

public class InputCalculator {

public static void main(String[] args){

try {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

System.out.print("First number: ");

int x = Integer.parseInt(br.readLine());

System.out.print("Second number: ");

int y = Integer.parseInt(br.readLine());

System.out.print("Operator: ");

String op = br.readLine();

int z;

if (op.equals("+")) {

z = x+y;

} else if (op.equals("-")){

z = x-y;

} else if (op.equals("*")){

z = x*y;

} else if (op.equals("/")){

z = x/y;

} else{

throw new java.lang.Error("Operator not recognized");

}

System.out.println("Result: " + z);

} catch (IOException e) {

e.printStackTrace();

}

}

}