using System;

namespace VendingMashine
{
    class Program
    {
        static void Main(string[] args)
        {
            string command = Console.ReadLine();
            double sum = 0.0;
            double price = 0.0;

            while (command != "Start")
            {
                double coins = double.Parse(command);
                if (coins == 0.1 || coins == 0.2 || coins == 0.5 || coins == 1 || coins == 2)
                {
                    sum += coins;
                }
                else
                {
                    Console.WriteLine($"Cannot accept {coins}");
                }
                command = Console.ReadLine();
            }
            if (command == "Start")
            {
                while (command != "End")
                {
                    command = Console.ReadLine();
                    if (command == "End")
                    {
                        break;
                    }

                    switch (command)
                    {
                        case "Nuts":
                            price = 2.0;
                            break;
                        case "Water":
                            price = 0.7;
                            break;
                        case "Crisps":
                            price = 1.5;
                            break;
                        case "Soda":
                            price = 0.8;
                            break;
                        case "Coke":
                            price = 1.0;
                            break;

                        default:
                            Console.WriteLine("Invalid product");
                            continue;
                            break;
                    }

                    if (price > sum && price!=0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                        //break;
                    }
                    else
                    {
                        Console.WriteLine($"Purchased {command.ToLower()}");
                        sum -= price;
                        price = 0;
                    }
                }
            }
            Console.WriteLine($"Change: {sum:f2}");
        }
    }
}