using System;

namespace VendingMachine
{
    class Program
    {
        static void Main(string[] args)
        {
            double money = 0;
            string coins = Console.ReadLine();
            while (coins != "Start")
            {
                if (coins != "0.1" && coins != "0.2" && coins != "0.5" && coins != "1" && coins != "2")
                {
                    Console.WriteLine($"Cannot accept {coins}");
                }
                else
                {
                    money += double.Parse(coins);
                }
                coins = Console.ReadLine();
            }
            string product = Console.ReadLine();
            double productPrice = 0;
            while (product != "End")
            {

                switch (product)
                {
                    case "Nuts":
                        productPrice = 2.0;
                        break;
                    case "Water":
                        productPrice = 0.7;
                        break;
                    case "Crisps":
                        productPrice = 1.5;
                        break;
                    case "Soda":
                        productPrice = 0.8;
                        break;
                    case "Coke":
                        productPrice = 1.0;
                        break;
                    default:
                        Console.WriteLine("Invalid product");
                        break;
                }

                if (money >= productPrice)
                {
                    Console.WriteLine($"Purchased {product.ToLower()}");
                    money = money - productPrice;
                    productPrice = 0;
                }
                else
                {
                    Console.WriteLine("Sorry, not enough money");
                    productPrice = 0;
                }
                product = Console.ReadLine();
            }
            Console.WriteLine($"Change: {money:f2}");
        }
    }
}