import java.io.IOException;

import java.io.BufferedReader;
import java.io.InputStreamReader;

@SuppressWarnings("unchecked")
public class Main {
    public static void main(String[] args) throws IOException {
        final String s;

        try (
            BufferedReader reader = new BufferedReader(
                new InputStreamReader(System.in))) {
            s = reader.readLine();
        }

        int N = Integer.parseInt(s);

        for (int i = N; i < 1000; i++) {
            String str = String.valueOf(i);
            if (str.charAt(0) == str.charAt(1)
                && str.charAt(1) == str.charAt(2)) {
                System.out.println(i);
                break;
            }
        }
    }
}

/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