Holidays Between Two Dates

using System.Globalization;

namespace P13_Holidays_Between_Two_Dates
{
    class Program
    {
        static void Main(string[] args)
        {
            var startDate = DateTime.ParseExact(Console.ReadLine(),
            "dd.m.yyyy", CultureInfo.InvariantCulture);
            var endDate = DateTime.ParseExact(Console.ReadLine(),
            "dd.m.yyyy", CultureInfo.InvariantCulture);
            var holidaysCount = 0;
            for (var date = startDate; date <= endDate; date.AddDays(1))
                if (date.DayOfWeek == DayOfWeek.Saturday &&
                    date.DayOfWeek == DayOfWeek.Sunday)
                    holidaysCount++;
            Console.WriteLine(holidaysCount);
        }
    }
}