using System;

​

[Flags]

public enum Weekdays

    {

        None = 0,

        Monday = 1,

        Tuesday = 2,

        Wednesday = 4,

        Thursday = 8,

        Friday = 16,

        Saturday = 32,

        Sunday = 64

    }

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Weekdays.Monday); // Monday

        Console.WriteLine(Weekdays.Monday | Weekdays.Tuesday); // Monday, Tuesday

        Console.WriteLine(Weekdays.Monday & Weekdays.Tuesday); // none

        Console.WriteLine((Weekdays)3); // Monday, Tuesda;

        Console.WriteLine((Weekdays)31); // Monday, Tuesday, Wednesday, Thursday, Friday

    }

}