using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _07.Vending_Machine
{
    class Program
    {
        static void Main(string[] args)
        {
            string comand;
            double money = 0;
            while (true)
            {
                comand = Console.ReadLine();

                if (comand == "Start")
                {
                    break;
                }
                double coin = double.Parse(comand);
                if (coin == 0.1 || coin == 0.2 || coin == 0.5 || coin == 1 || coin == 2)
                {
                    money += coin;
                }
                else
                {
                    Console.WriteLine($"Cannot accept {coin}");
                }


            }
            while (true)
            {


                string drink = Console.ReadLine().ToLower();
                if (drink == "end")
                {
                    Console.WriteLine($"Change: {money:F2}");

                    break;
                }

                if (drink == "nuts")
                {
                    if (money < 2)
                    {
                        Console.WriteLine("Sorry, not enough money");

                    }
                    else
                    {
                        money -= 2;

                        Console.WriteLine("Purchased nuts");


                    }
                }
                else if (drink == "water")
                {
                    if (money < 0.7)
                    {
                        Console.WriteLine("Sorry, not enough money");


                    }
                    else
                    {
                        money -= 0.7;

                        Console.WriteLine("Purchased water");

                    }


                }
                else if (drink == "crisps")
                {
                    if (money < 1.5)
                    {
                        Console.WriteLine("Sorry, not enough money");


                    }
                    else
                    {
                        money -= 1.5;

                        Console.WriteLine("Purchased crisps");

                    }

                }
                else if (drink == "soda")
                {
                    if (money < 0.8)
                    {
                        Console.WriteLine("Sorry, not enough money");


                    }
                    else
                    {
                        money -= 0.8;

                        Console.WriteLine("Purchased soda");


                    }

                }
                else if (drink == "coke")
                {
                    if (money < 1)
                    {
                        Console.WriteLine("Sorry, not enough money");


                    }
                    else
                    {
                        money -= 1.0;

                        Console.WriteLine("Purchased coke");

                    }

                }
                else
                {
                    Console.WriteLine("Invalid product");

                }


            }

        }

    }
}