using System;

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

            double totalSum = 0;

            while (coins != "Start")
            {
                double currentAmount = double.Parse(coins);

                if (currentAmount != 0.1
                    && currentAmount != 0.2
                    && currentAmount != 0.5
                    && currentAmount != 1
                    && currentAmount != 2)
                {
                    Console.WriteLine($"Cannot accept {currentAmount}");
                }

                else
                {
                    totalSum += currentAmount;
                }

                coins = Console.ReadLine();
            }

            string input = Console.ReadLine();

            while (input != "End")
            {

                double currentPrice = 0;
                switch (input)
                {
                    case "Nuts":

                            currentPrice = 2.0;

                        break;

                    case "Water":
                        currentPrice = 0.7;
                        break;
                    case "Crisps":
                        currentPrice = 1.5;
                        break;
                    case "Soda":
                        currentPrice = 0.8;
                        break;
                    case "Coke":
                        currentPrice = 1.0;
                        break;
                    default:
                        Console.WriteLine("Invalid product");
                        break;
                }
                if (totalSum >= currentPrice)
                {
                    totalSum -= currentPrice;
                    Console.WriteLine($"Purchased {input.ToLower()}");
                }
                else
                {
                    Console.WriteLine("Sorry, not enough money");
                }
                input = Console.ReadLine();


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