using System;

​

public class Program

{

    public static void Main()

    {

        start:

        Console.WriteLine("Enter a possible year above 1582 to infinity to see if it is a leep year.");

        string dog = Console.ReadLine();

        ulong cat;

        if (ulong.TryParse(dog, out cat))

        {

            if (cat < 1582)

        {

            Console.WriteLine("Please enter a date greater than the year 1582.");

        }

        else if (cat % 4 == 0)

        {

            Console.WriteLine("The year you have entered is a leap year.");

        }

        else if (cat > 3000)

        {

            Console.WriteLine("Don't look too far in the future.");

        }

        else

        {

            Console.WriteLine("The year you have entered is not a leap year.");

        }

            Console.WriteLine("Would you like to run this again ? Y/N");

        string choice = Console.ReadLine();

        if (choice == "y" || choice == "Y")

        goto start;

        }

    }

}