using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var firstDayOfThisMonth = new DateTime(DateTime.Now.Year,DateTime.Now.Month, 1);

        var workingDays = Enumerable.Range(0, 10)

            .Select(d => firstDayOfThisMonth.AddDays(d))

            .Where(d => !new[] { DayOfWeek.Saturday, DayOfWeek.Sunday }.Contains(d.DayOfWeek))

            .Where(NotWellKnownHolliday)

            .Take(3);

        foreach(var d in workingDays)           

            Console.WriteLine(d);

        var thirdWorkingDay = workingDays.Last();

        Console.WriteLine("3rd working day : " + thirdWorkingDay);

    }

    private static bool NotWellKnownHolliday(DateTime d)

    {

        var wellKnown = new[]{

            new Holliday(1,1),

            new Holliday(5,1)

        };

        return !wellKnown.Any(h => d.Month == h.Month && d.Day == h.Day);

    }

    private class Holliday

    {

        public Holliday(int month, int day)

        {

            Month = month;

            Day = day;

        }

        public int Month;

        public int Day;

    }

}