
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.HashSet;
import java.util.Scanner;

public class Main {

  public static void main(String[] args) throws FileNotFoundException {

//    Scanner cin = new Scanner(new FileReader("input.txt"));
    Scanner cin = new Scanner (System.in);

    int num = cin.nextInt();
    int numTemp = 0;
    for (int i=1;i<=9;i++){
      numTemp = i+i*10+i*100;
      if (numTemp >= num) break;
    }
    System.out.println(numTemp);

  }


}
/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