using System;

namespace _06._Easter_Decoration
{
    internal class Program
    {
        static void Main(string[] args)
        {
            double basket = 1.50;
            double wreath = 3.80;
            double chocolateBunny = 7;
            int purchasedItems = 0;
            double price = 0;
            string line = "";
            double average = 0;

            int countClientsInTheShop = int.Parse(Console.ReadLine());

            for (int i = 0; i < countClientsInTheShop; i++)
            {
                line = Console.ReadLine();
                while (line != "Finish")
                {
                    switch (line)
                    {
                        case "basket":
                            price += basket;
                            purchasedItems++;
                            break;
                        case "wreath":
                            price += wreath;
                            purchasedItems++;
                            break;
                        case "chocolate bunny":
                            price += chocolateBunny;
                            purchasedItems++;
                            break;
                        case "Finish":
                            if (purchasedItems % 2 == 0)
                            {
                                price *= 0.80;
                                average += price;
                                Console.WriteLine($"You purchased {purchasedItems} items for {price:f2} leva.");
                            }
                            break;
                    }

                    line = Console.ReadLine();
                }

            }
            average /= countClientsInTheShop;
            Console.WriteLine($"Average bill per client is: {average:f2} leva.");
        }
    }
}