using System;

​

public class Program

{

    [Flags]

    enum stuff

    {

        one = 1 << 0,

        two = 1 << 1,

        all = ~(1 << 1),

        four = 1 << 2

    }

    public static void Main(string[] args)

    {

        var sources = stuff.all;

        Console.WriteLine((int)stuff.one);

        Console.WriteLine((int)stuff.two);

        Console.WriteLine((int)stuff.all);

        if ((sources & stuff.one) == stuff.one) Console.WriteLine("One's included");

        if ((sources & stuff.two) == stuff.two) Console.WriteLine("Two's included");

        if ((sources & stuff.four) == stuff.four) Console.WriteLine("Four's included");

    }

}