using System;

​

public class Program

{   

    public static void Main()

    {

        var beginDate = DateTime.Today.AddDays(1);

        var endDate = new DateTime(2021, 6, 18);

        var numberDays = 0;

        while (beginDate <= endDate)

        {

            beginDate = beginDate.AddDays(1);

            if (beginDate.DayOfWeek == System.DayOfWeek.Saturday || beginDate.DayOfWeek == System.DayOfWeek.Sunday)

            {

            }

            else if (beginDate >= new DateTime(2021, 03, 27) && beginDate <= new DateTime(2021, 04, 5))

            {

            }

            else if (beginDate == new DateTime(2021, 05, 31) || beginDate == new DateTime(2021, 06, 01))

            {

            }

            else

                numberDays += 1;

        }

        Console.WriteLine(numberDays);

    }

}