using System;

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



            while (moneyInput != "Start")
            {
                double moneyInputValue = double.Parse(moneyInput);
                if (moneyInput == "0,1" || moneyInput == "0,2" || moneyInput == "0,5" || moneyInput == "1" || moneyInput == "2")
                {

                    totalPrice += moneyInputValue;

                }
                else
                {
                    Console.WriteLine($"Cannot accept {moneyInputValue}");
                }
                moneyInput = Console.ReadLine();
            }



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


            while (product != "End")
            {
                bool verify = false;
                string purchased = "";

                if (product == "Nuts")
                {
                    productPrice = 2;
                    purchased = "Purchased nuts";
                }
                else if (product == "Water")
                {
                    productPrice = 0.7;
                    purchased = "Purchased water";
                }
                else if (product == "Crisps")
                {
                    productPrice = 1.5;
                    purchased = "Purchased crisps";
                }
                else if (product == "Soda")
                {
                    productPrice = 0.8;
                    purchased = "Purchased soda";
                }
                else if (product == "Coke")
                {
                    productPrice = 1;
                    purchased = "Purchased coke";
                }
                else
                {
                    Console.WriteLine("Invalid product");
                    verify = true;
                    product = Console.ReadLine();
                }

                if (verify == false)
                {
                    if (totalPrice >= productPrice)
                    {
                        Console.WriteLine(purchased);
                        totalPrice -= productPrice;
                        product = Console.ReadLine();
                    }
                    else
                    {
                        Console.WriteLine("Sorry, not enough money");
                        product = Console.ReadLine();
                    }
                }

            }

            Console.WriteLine($"Change: {totalPrice:F2}");

        }
    }
}