import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if(n <= 111)System.out.println("111");
		else if(n > 111 && n <= 222)System.out.println("222");
		else if(n > 222 && n <= 333)System.out.println("333");
		else if(n > 333 && n <= 444)System.out.println("444");
		else if(n > 444 && n <= 555)System.out.println("555");
		else if(n > 555 && n <= 666)System.out.println("666");
		else if(n > 666 && n <= 777)System.out.println("777");
		else if(n > 777 && n <= 888)System.out.println("888");
		else if(n > 888 && 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