import java.util.*;

public class Main {

    long INF = Long.MAX_VALUE;

    public static void main(String[] args) {
        new Main().solve();
    }

    void solve() {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int ans=N/100;
        int A=ans*100+ans*10+ans;
        if(A>=N){
            ans=ans;
        }else{
            ans++;
        }
        for(int i=0;i<3;i++){
            System.out.print(ans);
        }
        System.out.println();
    }
}
/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