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using System;

namespace Вело_състезание
{
    class Program
    {
        static void Main(string[] args)
        {
            int countJ = int.Parse(Console.ReadLine());
            int countS = int.Parse(Console.ReadLine());
            string trase = Console.ReadLine();
            double money1 = 0;//juniors
            double money2 = 0;//senors

            if (trase == "trail")
            {
                money1 = 5.50;
                money2 = 7;
            }
            else if (trase == "cross-country")
            {
                money1 = 8;
                money2 = 9.50;
            }
            else if (trase == "downhill")
            {
                money1 = 12.25;
                money2 = 13.75;
            }
            else if (trase == "road")
            {
                money1 = 20;
                money2 = 21.50;
            }
            double finalSum =( money1 * countJ)
                + (money2 * countS);
            if (countJ+countS>=50)
            {
                finalSum = finalSum * 0.75;
            }
            Console.WriteLine($"{finalSum*0.95:f2}");

        }
    }
}