VendingMachine

using System;

namespace StrongNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            string coins = Console.ReadLine();

            double totalMoneyInsert = 0;



            while (coins != "Start")
            {
                double insertCoins = double.Parse(coins);
                if (insertCoins == 0.1 || insertCoins == 0.2 || insertCoins == 0.5 || insertCoins == 1 || insertCoins == 2)
                {
                    totalMoneyInsert += insertCoins;
                }

                else
                {
                    Console.WriteLine($"Cannot accept {insertCoins}");
                }
                coins = Console.ReadLine();
            }

            string product = Console.ReadLine();
            double price = 0;

            while (product != "End")
            {
                if (product == "Nuts")
                {
                    price = 2.0;
                }
                else if (product == "Water")
                {
                    price = 0.7;
                }
                else if (product == "Crisps")
                {
                    price = 1.5;
                }
                else if (product == "Soda")
                {
                    price = 0.8;
                }
                else if (product == "Coke")
                {
                    price = 1.0;
                }
                else
                {
                    Console.WriteLine("Invalid product");
                }

                if (totalMoneyInsert < price)
                {
                    totalMoneyInsert += price;
                    Console.WriteLine("Sorry, not enough money");
                }
                else
                {
                    Console.WriteLine($"Purchased {product.ToLower()}");
                }

                totalMoneyInsert -= price;
                product = Console.ReadLine();
            }


            Console.WriteLine($"Change: {totalMoneyInsert:f2}");

        }
    }
}