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 == 0) {
		    	System.out.println(n);
		    }
		    else {
		    	System.out.println(n /111 * 111 + 111);
		    	
		    }
		    
		    sc.close(); }
}

/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