Easter Decoration

using System;

namespace EasterDecoration
{
    class Program
    {
        static void Main(string[] args)
        {
            int clients = int.Parse(Console.ReadLine());
            double total = 0;

            for (int i = 0; i < clients; i++)
            {
                string stock = Console.ReadLine();
                int counter = 0;
                double sum = 0;

                while (stock != "Finish")
                {
                    switch (stock)
                    {
                        case "basket":
                            sum += 1.5;
                            break;

                        case "wreath":
                            sum += 3.8;
                            break;

                        case "chocolate bunny":
                            sum += 7;
                            break;
                    }
                    stock = Console.ReadLine();
                    counter++;
                }

                if (counter % 2 == 0)
                {
                    sum *= 0.8;
                }

                total += sum;
                Console.WriteLine($"You purchased {counter} items for {sum:F2} leva.");
            }
            Console.WriteLine($"Average bill per client is: {total / clients:F2} leva.");
        }
    }
}