ComputerStore

using System;

namespace ComputerStore
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string command = Console.ReadLine();
            double totalPricesWithoutTaxes = 0;
            double totalTaxes = 0;
            double totalPricesWithTaxes = 0;
            while (command!= "special" && command!="regular")
            {
                double priceWithoutTax = double.Parse(command);
                if (priceWithoutTax <= 0)
                {
                    Console.WriteLine($"Invalid price!");
                    command = Console.ReadLine();
                    continue;
                }

                totalTaxes += 0.20 * priceWithoutTax;
                totalPricesWithoutTaxes += priceWithoutTax;
                command = Console.ReadLine();
            }

            if (command == "special")
            {
                totalPricesWithTaxes = (totalPricesWithoutTaxes + totalTaxes) - 0.1 * (totalPricesWithoutTaxes + totalTaxes);
                if (totalPricesWithTaxes == 0)
                {
                    Console.WriteLine("Invalid order!");
                    return;
                }

                Console.WriteLine($"Congratulations you've just bought a new computer!");
                Console.WriteLine($"Price without taxes: {totalPricesWithoutTaxes:f2}$");
                Console.WriteLine($"Taxes: {totalTaxes:f2}$");
                Console.WriteLine("-----------");
                Console.WriteLine($"Total price: {totalPricesWithTaxes:f2}$");
            }

            else if (command == "regular")
            {
                totalPricesWithTaxes = (totalPricesWithoutTaxes + totalTaxes);
                if (totalPricesWithTaxes == 0)
                {
                    Console.WriteLine("Invalid order!");
                    return;
                }

                Console.WriteLine($"Congratulations you've just bought a new computer!");
                Console.WriteLine($"Price without taxes: {totalPricesWithoutTaxes:f2}$");
                Console.WriteLine($"Taxes: {totalTaxes:f2}$");
                Console.WriteLine("-----------");
                Console.WriteLine($"Total price: {totalPricesWithTaxes:f2}$");
            }

        }
    }
}