using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Every four years, we add an extra day, February 29, to our calendars. These extra days – called leap days – help synchronize our" + "\n" + "human-created calendars with Earth’s orbit around the sun and the actual passing of the seasons. ");

        start:

            Console.WriteLine("Please enter a year");

        int year;

        string number = Console.ReadLine();

        if (int.TryParse(number, out year))

        {

            if (year > 1582 && year < 3000)

            {

                if (year < 1582)

                {

                    Console.WriteLine("Enter a more recent year");

                }

                else if (year > 3000)

                {

                    Console.WriteLine("Dont look so far into the future");

                }

​

                if (year % 4 == 0)

                {

                    Console.WriteLine(year + " is a leap year");

                }

                else

                {

                    Console.WriteLine(year + " is a common year");

                }

​

                Console.WriteLine("Woudl you like to restart the program?y/n");

                string restart = Console.ReadLine();

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

                {

                    Console.Clear();

                    goto start;

                }

                else

                {

                    Console.Clear();

                }

            }

            else

            {

                Console.WriteLine("Enter a year between 1582 and 3000");

                goto start;

            }

        }

        else

        {

            Console.WriteLine("Please enter a positive integer");

            goto start;

        }

    }

}