import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    int target = Integer.parseInt(br.readLine());

    int count = 0;
    int start = 665;
    while (true) {
      start++;
      if (String.valueOf(start).contains("666")) {
        count++;
        if (count == target) {
          System.out.println(start);
          break;
        }
      }
    }
  }

}