import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author hakamada
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        ABC111_2 solver = new ABC111_2();
        solver.solve(1, in, out);
        out.close();
    }

    static class ABC111_2 {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int NN = in.nextInt();
            String[] N = String.valueOf(NN).split("");
            String leftone = N[0];

            if ((leftone.compareTo(N[1]) == 0) & (leftone.compareTo(N[2]) == 0)) {
                out.println(N[0] + N[0] + N[0]);
                return;
            }

            while (true) {
                NN += 1;
                N = String.valueOf(NN).split("");
                if ((N[0].compareTo(N[1]) == 0) && (N[1].compareTo(N[2]) == 0)) {
                    out.println(NN);
                    return;
                }
            }
        
        
        
/*
        for (int i = 1; i < 3; i++) {
            if (Integer.parseInt(leftone) > Integer.parseInt(N[i])) {
                out.println(N[0] + N[0] + N[0]);
                return;
            }
        }
        leftone = String.valueOf(Integer.parseInt(leftone) + 1);
        out.println(leftone+leftone+leftone);
        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