using System;

namespace Conditional_Statements_Advanced___More_Exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            double juniors = double.Parse(Console.ReadLine());
            double seniors = double.Parse(Console.ReadLine());
            string trace = Console.ReadLine();
            double sum = 0;

            if (trace == "trail")
            {
                sum = juniors * 5.5 + seniors * 7;
            }
             if (trace == "cross-country")
            {
                sum = juniors * 8 + seniors * 9.50;
            }
            if (trace == "downhill")
            {
                sum = juniors * 12.25 + seniors * 13.75;
            }
            if (trace == "road")
                    {
                sum = juniors * 20 + seniors * 21.50;
            }
            double costs = (5 * sum) / 100;
            double f = sum - costs;
            Console.WriteLine($"{Math.Abs(f):f2}");

        }
    }
}