import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String n = String.valueOf(N);
		int num =Integer.valueOf(n.substring(0,1));
		
		if(num<Integer.valueOf(n.substring(1,2))){
			num++;
			System.out.println(""+num+num+num);
		}else if(num<Integer.valueOf(n.substring(2,3))){
			num++;
			System.out.println(""+num+num+num);
		}else {
			System.out.println(""+num+num+num);
		}
		
		sc.close();
	}
}
/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