import java.util.Scanner;

public class Main {
    static int N;
    static int THRESHOLD = 111;

    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        N = scanner.nextInt();
        scanner.close();

        for(int i = 0; i < 9; i++) {
            if(N > THRESHOLD * i && N <= THRESHOLD * (i + 1)) {
                System.out.println(THRESHOLD * (i + 1));
                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