C#判断是否润年

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int  years = int.Parse(Console.ReadLine());
            if (years % 400 == 0 || (years % 100 == 0 && years % 4 != 0))
            {
                Console.Write("是闰年。");
            }
            else
            {
                Console.Write("是平年。");
            }
            
            Console.ReadLine();
        }
    }
}