Aluminum Joinery

using System;

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

            if (volume <= 10)
            {
                Console.WriteLine("Invalid order");
            }
            else
            {
                switch (size)
                {
                    case "90X130":
                        sum = 110;

                        if (volume > 30 && volume <= 60)
                        {
                            sum *= 0.95;
                        }
                        else if (volume > 60)
                        {
                            sum *= 0.92;
                        }
                        break;

                    case "100X150":
                        sum = 140;

                        if (volume > 40 && volume <= 80)
                        {
                            sum *= 0.94;
                        }
                        else if (volume > 80)
                        {
                            sum *= 0.9;
                        }
                        break;

                    case "130X180":
                        sum = 190;

                        if (volume > 20 && volume <= 50)
                        {
                            sum *= 0.93;
                        }
                        else if (volume > 50)
                        {
                            sum *= 0.88;
                        }
                        break;

                    case "200X300":
                        sum = 250;

                        if (volume > 25 && volume <= 50)
                        {
                            sum *= 0.91;
                        }
                        else if (volume > 50)
                        {
                            sum *= 0.86;
                        }
                        break;
                }

                double total = sum * volume;

                if (delivery == "With delivery")
                {
                    total += 60;
                }
                if (volume > 99)
                {
                    total *= 0.96;
                }

                Console.WriteLine($"{total:F2} BGN");
            }
        }
    }
}