import java.util.*;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int n = sc.nextInt();
                int answer = 0;
		int digit = n/100;
		n = n - digit*100;
                if(digit*10+ digit >= n){
			answer = digit*100+ digit*10 + digit;
		}else{
			answer = (digit+1)*100+ (digit+1)*10 + digit+1;
		}
		System.out.println(answer);
	}
}
/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