using System;

public class Program

{

    public static void Main()

    {

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

        string year = Console.ReadLine();

        Double decimal_year = Double.Parse(year) / 4;

        Double decimalyear_2 = Math.Round(decimal_year);

​

        if(decimalyear_2 < decimal_year)

        {

            decimalyear_2 = decimalyear_2 + 1;

        }

        Console.WriteLine(decimalyear_2*=4);        

        for (int x = 0; x<20; x+=1){

        Console.WriteLine(decimalyear_2+=4);

        }

    }

}