using System;

namespace Lab_Arr_Orders
{
    class Program
    {
        static void Main(string[] args)
        {
            string order = Console.ReadLine();
            int number = int.Parse(Console.ReadLine());

            switch (order)
            {
                case "coffee ": Console.WriteLine($"{(double)number*1.50:f2}"); break;
                case "water ": Console.WriteLine($"{(double)number * 1.00:f2}"); break;
                case "coke": Console.WriteLine($"{(double)number * 1.40:f2}"); break;
                case "snacks": Console.WriteLine($"{(double)number * 2.00:f2}"); break;
            }
        }
    }
}