import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // 標準入力を受け取る
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();

        // Nが111の倍数となるまで1を足し続ける
        while (N % 111 != 0){
            N++;
        }

        // 全ての桁の数が等しくなったNを標準出力
        System.out.println(N);

    }

}
/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