using System;

public class Program

{

    public static void Main()

    {

        int year = 2008;

        Console.WriteLine($"{year} / 4 = {year / 4}");

        Console.WriteLine($"{year} * 4 = {year * 4}");

        Console.WriteLine($"{year} - 4 = {year - 4}");

        Console.WriteLine($"{year} + 4 = {year + 4}");

        Console.WriteLine($"{year} % 4 = {year % 4}");

        Console.WriteLine($"Is year {year} leap? {IsLeapYear(year)}");

    }

    public static bool IsLeapYear(int year)

    {

        /*

        if (year is not divisible by 4) then (it is a common year)

        else if (year is not divisible by 100) then (it is a leap year)

        else if (year is not divisible by 400) then (it is a common year)

        else (it is a leap year)

        */

        if (year % 4 != 0)

            return false;

        else if (year % 100 != 0)

            return true;

        else if (year % 400 != 0)

            return false;

        else

            return true;

    }

}