using System;

public class Program

{

    [Flags]

    public enum Days

    {

        None      = 0b_0000_0000,  // 0

        Monday    = 0b_0000_0001,  // 1

        Tuesday   = 0b_0000_0010,  // 2

        Wednesday = 0b_0000_0100,  // 4

        Thursday  = 0b_0000_1000,  // 8

        Friday    = 0b_0001_0000,  // 16

        Saturday  = 0b_0010_0000,  // 32

        Sunday    = 0b_0100_0000,  // 64

        Weekend   = Saturday | Sunday

    }

    public static void Main()

    {

        Days meetingDays = Days.Monday | Days.Wednesday | Days.Friday;

        Console.WriteLine(meetingDays);

        // Output:

        // Monday, Wednesday, Friday

​

        Days workingFromHomeDays = Days.Thursday | Days.Friday;

        Console.WriteLine($"Join a meeting by phone on {meetingDays & workingFromHomeDays}");

        // Output:

        // Join a meeting by phone on Friday

​

        bool isMeetingOnTuesday = (meetingDays & Days.Tuesday) == Days.Tuesday;

        Console.WriteLine($"Is there a meeting on Tuesday: {isMeetingOnTuesday}");

        // Output:

        // Is there a meeting on Tuesday: False

​

        var a = (Days)37;

        Console.WriteLine(a);

        // Output:

        // Monday, Wednesday, Saturday

    }

}