import java.util.*;
import java.math.*;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && 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