CodeWarsKata - Double Cola - 01/2018

double_cola.cs

using System;

public class Line
    {
        public static string WhoIsNext(string[] names , long n)
        { 
            long q = (n + 4);
            for (; q >= 10;)q /= 2;
            q -= 5;
            return names[q];
        }
    }