using System;

namespace Computer_Store
{
    internal class Program
    {
        static void Main(string[] args)
        {
            double totalPrice = 0;

            do {
                string input = Console.ReadLine();
                if (input == "special" || input == "regular")
                {
                    break;
                }

                double price = 0;

                bool valid = double.TryParse(input, out price);

                if (!valid || price <= 0)
                {
                    Console.WriteLine("Invalid price!");
                    continue;
                }

                totalPrice += price;
            } while (true);

            Console.WriteLine(totalPrice);

        }
    }
}