using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var foo = 5;

        var awesomeFoos = new[] { 3, 5 };

        var popularFoos = new[] { 4, 5 };

        var fooIsAwesome = awesomeFoos.Contains(foo);

        var fooIsPopular = popularFoos.Contains(foo);

        if (fooIsAwesome)

        {

            Console.WriteLine("Foo is awesome");

        }

        if (fooIsPopular)

        {

            Console.WriteLine("Foo is popular");

        }

    }

}

​