​

public class Program

{

    public static void Main(string[] args)

    {

        string me = null;

        var others = new List<string>() { "Adam", "Caroline", "Rebecca", "Frank" };

        Console.WriteLine(License("Eric", 2, others));

    }

​

    public static int License(string me, int agents, List<string> others)

    {

        others.Add(me);

        var meNumber = others.IndexOf(me);

​

        if (agents <= others.Count)

            return 0;

        else

            (others.Count - agents) * 20;

    }

}