
import java.util.Scanner;

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