using System;

​

public class Program

{

    public static void Main()

    {

        Console.Write("Enter a year: ");

        int year = int.Parse(Console.ReadLine());

​

        bool isLeapYear = false;

​

        if (year % 4 == 0)

        {

            if (year % 100 != 0 || year % 400 == 0)

            {

                isLeapYear = true;

            }

        }

​

        if (isLeapYear)

        {

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

        }

        else

        {

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

        }

    }

}