07. Vending Machine

using System;

namespace VendingMachine
{
    class Program
    {
        static void Main(string[] args)
        {
            string cash = Console.ReadLine();
            double sum = 0;

            while (cash != "Start")
            {
                double coin = double.Parse(cash);

                switch (coin)
                {
                    case 0.1:
                    case 0.2:
                    case 0.5:
                    case 1:
                    case 2:
                        sum += coin;
                        break;

                    default:
                        Console.WriteLine($"Cannot accept {coin}");
                        break;
                }

                cash = Console.ReadLine();
            }

            while (cash != "End")
            {
                cash = Console.ReadLine();
                if (cash == "End")
                {
                    break;
                }
                double price = 0;

                switch (cash)
                {
                    case "Nuts":
                        price = 2;
                        break;
                    case "Water":
                        price = 0.7;
                        break;
                    case "Crisps":
                        price = 1.5;
                        break;
                    case "Soda":
                        price = 0.8;
                        break;
                    case "Coke":
                        price = 1;
                        break;
                    default:
                        Console.WriteLine("Invalid product");
                        break;
                }

                if (sum < price)
                {
                    Console.WriteLine("Sorry, not enough money");
                }
                else if ( sum >= price && (cash == "Nuts" || cash == "Water" || cash == "Crisps" || cash == "Soda" || cash == "Coke"))
                {
                    Console.WriteLine($"Purchased {cash.ToLower()}");
                    sum -= price;
                }
            }
            Console.WriteLine($"Change: {sum:F2}");
        }
    }
}