import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
  int n = sc.nextInt();
  if(n <= 111)System.out.println("111");
  else if(n <= 222)System.out.println("222");
  else if(n <= 333)System.out.println("333");
  else if(n <= 444)System.out.println("444");
  else if(n <= 555)System.out.println("555");
  else if(n <= 666)System.out.println("666");
  else if(n <= 777)System.out.println("777");
  else if(n <= 888)System.out.println("888");
  else if(n <= 999)System.out.println("999");
}}

/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