import java.util.Scanner;
 
public class Main {
	public static void main(String args[]) {
		Scanner scan = new Scanner(System.in);
		int val = scan.nextInt();
		int base = (val / 100);
		if (val <= getVal(base)) {
			System.out.println(getVal(base));
		} else {
			base++;
			System.out.println(getVal(base));
		}
	}
	public static int getVal(int base) {
		return base * 100 + base * 10 + base;
	}
}
/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