import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int i = scanner.nextInt();
        if(i <= 111){
            System.out.println("111");
        }else if(i <= 222){
            System.out.println("222");
        }else if(i <= 333){
            System.out.println("333");
        }else if(i <= 444){
            System.out.println("444");
        }else if(i <= 555){
            System.out.println("555");
        }else if(i <= 666 ){//悪魔の数字！フ　リ　ー　メ　イ　ソ　ン　！
            System.out.println("666");
        }else if(i <= 777){
            System.out.println("777");
        }else if(i <= 888){
            System.out.println("888");
        }else if(i <= 999){
            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