using System;

public class Program

{

    public static void Main()

    {

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

        string yearString = Console.ReadLine();

        try {

            int year = Convert.ToInt32(yearString);

            bool leap = (year % 4 == 0) && ( (year % 100 != 0) || ((year % 100 == 0) && (year % 400 == 0)) );

            if (leap == true) {

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

            }

            else {

                Console.WriteLine(year + " is not a leap year.");

            }

        }

        catch {

            Console.WriteLine("It seems there was a problem. \nAre your sure you input a year? \nIf you did, please try a year closer to the present.\nYears too far into the future do not work with this program. \nPlease run the program again.");

        }

    }

}