import java.util.Scanner;

public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        
        int n = Integer.parseInt(sc.next());
        
        if(n > 888){
            System.out.println(999);
        }else if(n > 777){
            System.out.println(888);
        }else if(n > 666){
            System.out.println(777);
        }else if(n > 555){
            System.out.println(666);
        }else if(n > 444){
            System.out.println(555);
        }else if(n > 333){
            System.out.println(444);
        }else if(n > 222){
            System.out.println(333);
        }else if(n > 111){
            System.out.println(222);
        }else{
            System.out.println(111);
        }
    }
}
/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