import java.util.*;

public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    
    if(N<=111){
    System.out.println("111");
    }else if(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        }
    }
}
/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