
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;

class Main {

    static final int MOD = 1000000007;

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String ns = sc.next();
        int n = Integer.parseInt(ns);
        String p = "";
        for(int i=0;i<ns.length();i++)p+=ns.charAt(0);
        if(n<=Integer.parseInt(p))System.out.println(p);
        else{
            p = "";
            for(int i=0;i<ns.length();i++)p+=((char)(ns.charAt(0)+1));
            System.out.println(p);
        }

    }
}
/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