import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		if(100<=N&&N<=111) {
			System.out.println(111);
		}
		else if(112<=N&&N<=222) {
			System.out.println(222);
		}
		else if(223<=N&&N<=333) {
			System.out.println(333);
		}
		else if(334<=N&&N<=444) {
			System.out.println(444);
		}
		else if(445<=N&&N<=555) {
			System.out.println(555);
		}
		else if(556<=N&&N<=666) {
			System.out.println(666);
		}
		else if(667<=N&&N<=777) {
			System.out.println(777);
		}
		else if(778<=N&&N<=888) {
			System.out.println(888);
		}
		else if(889<=N&&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