import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String n = sc.next();
		String firstNum = n.substring(0, 1);

		if (Integer.parseInt(n) > Integer.parseInt(firstNum + firstNum + firstNum)) {
			int a = Integer.parseInt(firstNum) + 1;
			System.out.println(String.valueOf(a) + String.valueOf(a) + String.valueOf(a));
		} else if (Integer.parseInt(n) <= Integer.parseInt(firstNum + firstNum + firstNum)) {
			System.out.println(firstNum + firstNum + firstNum);
		}
	}
}
/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