Coffee Machine

using System;

namespace CoffeeMachine
{
    class Program
    {
        static void Main(string[] args)
        {
            string coffee = Console.ReadLine();
            string sugar = Console.ReadLine();
            int volume = int.Parse(Console.ReadLine());
            double sum = 0;

            switch (coffee)
            {
                case "Espresso":

                    if (sugar == "Without")
                    {
                        sum = volume * 0.9;
                        sum *= 0.65;
                    }
                    else if (sugar == "Normal")
                    {
                        sum = volume;
                    }
                    else if (sugar == "Extra")
                    {
                        sum = volume * 1.2;
                    }
                    if (volume > 5)
                    {
                        sum *= 0.75;
                    }
                    break;
                case "Cappuccino":

                    if (sugar == "Without")
                    {
                        sum = volume;
                        sum *= 0.65;
                    }
                    else if (sugar == "Normal")
                    {
                        sum = volume * 1.2;
                    }
                    else if (sugar == "Extra")
                    {
                        sum = volume * 1.6;
                    }
                    break;

                case "Tea":

                    if (sugar == "Without")
                    {
                        sum = volume * 0.5;
                        sum *= 0.65;
                    }
                    else if (sugar == "Normal")
                    {
                        sum = volume * 0.6;
                    }
                    else if (sugar == "Extra")
                    {
                        sum = volume * 0.7;
                    }
                    break;
            }
            if (sum > 15)
            {
                sum *= 0.8;
            }

            Console.WriteLine($"You bought {volume} cups of {coffee} for {sum:F2} lv.");
        }
    }
}