package backjoon;

// https://www.acmicpc.net/problem/1436

// 영화감독 숌

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class _1436 {

public static void main(String[] args) throws IOException {

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

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

// memory 158540 runtime 340

int num = 666; // 666이 첫 영화시작이니까

int cnt = 1; // 몇번째 영화인지

while(N != cnt){

num++;

if(String.valueOf(num).contains("666")) {

cnt++;

}

}

System.out.println(num);

}

}

/*

input

2

output

1666

*/