using System;

namespace zad7
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            double Sum = 0;

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

                if (coins == 0.1)
                {
                    Sum += 0.1;
                } else if (coins == 0.2) {
                    Sum += 0.2;
                } else if (coins == 0.5)
            {
                Sum += 0.5;

            } else if (coins == 1)
                {
                    Sum += 1;
                } else if (coins == 2)
                {
                    Sum += 2;
                } else
                {
                    Console.WriteLine($"Cannot accept {coins:f1}");
                }
                input = Console.ReadLine();
            }
            input = Console.ReadLine();

           while (input != "End")
            {
                double testSum = Sum;
                if (input == "Nuts")
                {
                    testSum -= 2;
                    if (testSum < 0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                    } else
                    {
                        Console.WriteLine("Purchased nuts");
                        Sum = testSum;
                    }
                } else if (input == "Water")
                {
                    testSum -= 0.7;
                    if (testSum < 0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                    } else
                    {
                        Console.WriteLine("Purchased water");
                        Sum = testSum;
                    }
                } else if (input == "Crisps")
                {
                    testSum -= 1.5;
                    if (testSum < 0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                    } else
                    {
                        Console.WriteLine("Purchased crisps");
                        Sum = testSum;
                    }
                } else if (input == "Soda")
                {
                    testSum -= 0.8;
                    if (testSum < 0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                    } else
                    {
                        Console.WriteLine("Purchased soda");
                        Sum = testSum;
                    }
                } else if (input == "Coke")
                {
                    testSum -= 1;
                    if (testSum < 0)
                    {
                        Console.WriteLine("Sorry, not enough money");
                    } else
                    {
                        Console.WriteLine("Purchased coke");
                        Sum = testSum;
                    }
                } else
                {
                    Console.WriteLine("Invalid product");
                }
                input = Console.ReadLine();
            }
            Console.WriteLine($"Change: {Sum:f2}");

    }
    }
}