public static void Test() { Solution s = new Solution(); int bt = 9, ex = 3; Console.WriteLine($"{bt} {ex} " + s.NumWaterBottles(bt, ex)); bt = 15; ex = 4; Console.WriteLine($"{bt} {ex} " + s.NumWaterBottles(bt, ex)); bt = 5; ex = 5; Console.WriteLine($"{bt} {ex} " + s.NumWaterBottles(bt, ex)); bt = 2; ex = 3; Console.WriteLine($"{bt} {ex} " + s.NumWaterBottles(bt, ex)); }