import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		if (n <= 111) {
			System.out.println(111);
			return;
		}
		if (n <= 222) {
			System.out.println(222);
			return;
		}
		if (n <= 333) {
			System.out.println(333);
			return;
		}
		if (n <= 444) {
			System.out.println(444);
			return;
		}
		if (n <= 555) {
			System.out.println(555);
			return;
		}
		if (n <= 666) {
			System.out.println(666);
			return;
		}
		if (n <= 777) {
			System.out.println(777);
			return;
		}
		if (n <= 888) {
			System.out.println(888);
			return;
		}
		if (n <= 999) {
			System.out.println(999);
			return;
		}
	}
}

/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