영화감독 숌

import java.io.*;


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

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        /*
        * 1부터 숫자를 증가시켜가며 반복
        * 666이 존재하는지 계산후 있으면 카운트를 증가
        * 입력한 카운트가 되면 반복종료
        * */

        int number = 1;
        int num = 0;
        int count = 1;
        int goal = Integer.parseInt(br.readLine());
        while(count <= goal){



        if (String.valueOf(number).contains("666")) {
            num = number;
            count++;
        }
        number++;

        }
        bw.write(String.valueOf(num));

        bw.flush();
        bw.close();

    }
}