using System;

public class Program

{

    public static void Main()

    {

        Console.Write("Input year: ");

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

        Console.WriteLine();

        string check = isLeapYear(_year) == true ? "" : "NOT ";

        Console.WriteLine("{0} is {1}Leap year.", _year, check);

    }

    static bool isLeapYear(int year)

    {

        if((year%4 == 0 && year%100 != 0) || (year%100 == 0 && year%400 == 0))

           {

               return true;

           }

           else

           {

               return false;

           }

    }

}