
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		
		int nnn = 0;
		int ans = 0;
		for (int i = 1; i <= 9; i++) {
			nnn = i + (i * 10) + (i* 100); 
			if(n <= nnn) {
				ans = nnn; 
				break;
			}
		}
		System.out.println(nnn);
		
	}
}
/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