import java.lang.reflect.Array;
import java.util.*;
public class Main{
    public static void main(String[] args)throws Exception{
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        if ((n / 100) * 111 >= n){
            System.out.println((n / 100 ) * 111);
        }else{
            System.out.println((n / 100 + 1) * 111);
        }

    }
}
/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