using System;

public class Program

{

    public static void Main()

    {

        int chkYear;

        Console.WriteLine("Check whether a given year is a leap year or not");

        Console.WriteLine("...................................................");

        bool finish = false

        do

        {

        Console.WriteLine("Enter the year you want to check (or 0 to end)");

        chkYear = Convert. ToInt32(Console.ReadLine());

        if(chkYear == 0)

        {

        finish = true;

            Console.WriteLine("All done");

        }

        else if ((chkYear %400)==0)

        {

        Console.WriteLine("{0} is a leap year", chkYear);

    }

        }