import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.close();

        for (int i = n; i < 1000; i++) {
            int tmp = i;
            int a = tmp % 10;
            tmp /= 10;
            int b = tmp % 10;
            tmp /= 10;
            int c = tmp % 10;

            if (a == b && b == c) {
                System.out.println(i);
                return;
            }
        }
    }
}
/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