using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string lstrMSAcBal = string.Join("", "?<>***".ToCharArray().Where(Char.IsDigit));

        Int32 Amnt = (Convert.ToInt32(lstrMSAcBal));

        if(Amnt < 0){

            Console.WriteLine("Hello World In valied" + lstrMSAcBal);

        }

        else{

        Console.WriteLine("Hello World" + lstrMSAcBal);

        }

    }

}