using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> someValues = new List<int>() {

            1,

            1,

            1,

            2,

            10,

            4,

            8,

            4

        };

        Test valueToFind = Test.C | Test.D;

        int howManyFound = 0;

        foreach(var val in someValues)

        {

            if(valueToFind.HasFlag((Test)val))

               {

                   ++howManyFound;

               }

        }

        Console.WriteLine(howManyFound);

    }

    [Flags]

    public enum Test{

        A = 1,

        B = 2,

        C = 4,

        D = 8,

        E = 16

    }

}