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

namespace ConsoleApp23
{
    class Program
    {
        static void Main(string[] args)
        {
            double budget = double.Parse(Console.ReadLine());

            int countOfBoughtProducts = 0;
            double priceOfBoughtProdurcts = 0;
            double productPrice = 0;

            while (budget >= productPrice)
            {
                string productName = Console.ReadLine();

                if (productName == "Stop")
                {
                    Console.WriteLine($"You bought {countOfBoughtProducts} products for {priceOfBoughtProdurcts:f2} leva.");
                    break;
                }

                 productPrice = double.Parse(Console.ReadLine());

                if (productName != "Stop")
                {

                    countOfBoughtProducts++;

                    if (countOfBoughtProducts == 3)
                    {
                        productPrice = productPrice / 2;
                    }

                    priceOfBoughtProdurcts += productPrice;
                    budget -= productPrice;

                }


            }


             if (budget < productPrice)
            {
                Console.WriteLine("You don't have enough money!");
                Console.WriteLine($"You need {Math.Abs(budget):f2} leva!");
            }
        }
    }
}