import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		String N = sc.nextLine();
		String[] strArray = N.split("");
        int a = Integer.parseInt(strArray[0]);
        int b = Integer.parseInt(strArray[1]);
        int c = Integer.parseInt(strArray[2]);
      
      if((a == b && a < c) || (a < b)){
        a++; 
      }
     System.out.println(a + "" + a + "" + a);

    }
}
/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