import java.util.Scanner;
class Main{
    public static void main(String arg[]){
        Scanner scn=new Scanner(System.in);
        String n=scn.next();
        int num=Integer.parseInt(n);
        while(true){
            if(n.charAt(0)==n.charAt(1)&&n.charAt(1)==n.charAt(2)){
                break;
            }
            num++;
            n=String.valueOf(num);
        }
        System.out.println(n);
    }
}
/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