public static int Calculate(IEnumerable <int> masses)
        {
            int total = 0;

            foreach (int i in masses)
            {
                total += FuelCalculator.RequiredFuel(i);
            }

            return(total);
        }
        public static int CaluclateWithFuel(IEnumerable <int> masses)
        {
            var fleetFuel = 0;

            foreach (int i in masses)
            {
                int fuel      = FuelCalculator.RequiredFuel(i);
                int totalFuel = 0;
                while (fuel > 0)
                {
                    totalFuel += fuel;
                    fuel       = FuelCalculator.RequiredFuel(fuel);
                }
                fleetFuel += totalFuel;
            }


            return(fleetFuel);
        }