using System;

namespace Vending_machines
{
    class Program
    {
        static void Main(string[] args)
        { bool coins = true;
            string coinsA = "";
            double money = 0;
            double total = 0;
            while (coins == true)
            { coinsA = Console.ReadLine();
                if (coinsA == "0.1" || coinsA == "0.2" || coinsA == "0.5" || coinsA == "1" || coinsA == "2")
                {
                    money = Convert.ToDouble(coinsA);
                    total += money;
                }
                else if(coinsA == "Start")
                { coins = false; }
                else if(coinsA != "0.1" || coinsA != "0.2" || coinsA != "0.5" || coinsA != "1" || coinsA != "2")
                {
                    Console.WriteLine($"Cannot accept {coinsA}");
                }
            }
            bool order = true;
            string orderA = "";
            while (order == true)
            {
                orderA = Console.ReadLine();
                switch (orderA)
                {
                    case "Nuts":
                           total -= 2.0;
                        if (total < 0)
                        {
                            Console.WriteLine("Sorry, not enough money");
                            total += 2.0;
                        }
                        else
                        { Console.WriteLine($"Purchased nuts" ); }
                        break;

                    case "Water":
                        total -= 0.7;
                        if (total < 0)
                        {
                            Console.WriteLine("Sorry, not enough money");
                            total += 0.7;
                        }
                        else
                        { Console.WriteLine($"Purchased water"); }
                        break;

                    case "Crisps":
                        total -= 1.5;
                        if (total < 0)
                        {
                            Console.WriteLine("Sorry, not enough money");
                            total += 1.5;
                        }
                        else
                        { Console.WriteLine($"Purchased crisps"); }
                        break;

                    case "Soda":
                        total -= 0.8;
                        if (total < 0)
                        {
                            Console.WriteLine("Sorry, not enough money");
                            total += 0.8;
                        }
                        else
                        { Console.WriteLine($"Purchased soda"); }
                        break;

                    case "Coke":
                        total -= 1.0;
                        if (total < 0)
                        {
                            Console.WriteLine("Sorry, not enough money");
                            total += 1.0;
                        }
                        else
                        { Console.WriteLine($"Purchased coke"); }
                        break;
                    case "End":
                        order = false;
                        break;
                    default:
                        Console.WriteLine("Invalid product");
                        break;
                }

            }

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