import java.util.*;
class Main {
  public static void main (String[] args) {
      
      Scanner scan = new Scanner(System.in);
      
      int x = scan.nextInt();
      
      int y =0;
      
      for(int i=1; i<10; i++){
        y = 111*i;
        if(y>=x){
          break;
          }
          }
         System.out.println(y);
         }
        
}
/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