import java.util.*;

public class Main {
  static int[] list;
    public static void main(String[] args) throws Exception{
      Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      for (int i = n; i <= 999; i++) {
        char[] a = String.valueOf(i).toCharArray();
        if(a[0] == a[1] &&a[0] == a[2]) {
          System.out.println(i);
          break;
        } 
      }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz