using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Bike_Race
{
    class Program
    {
        static void Main(string[] args)
        {
            int juniors = int.Parse(Console.ReadLine());
            int seniors = int.Parse(Console.ReadLine());
            string trace = Console.ReadLine();
            double seniorProfit = 0;
            double juniorProfit = 0;
            int totalRacers = juniors + seniors;
            double totalProfit = 0;


            if (trace == "trail")
            {
                juniorProfit = juniors * 5.50;
                seniorProfit = seniors * 7;
            }
            else if (trace == "cross-country")
            {
                if (totalRacers >= 50)
                {
                    juniorProfit = (juniors * 8) - juniors * 8 * 0.25;
                    seniorProfit = (seniors * 9.50) - seniors * 9.50 * 0.25;
                }
                else
                {
                    juniorProfit = juniors * 8;
                    seniorProfit = seniors * 9.50;
                }
            }
            else if (trace == "downhill")
            {
                juniorProfit = juniors * 12.25;
                seniorProfit = seniors * 13.75;
            }
            else if (trace == "road")
            {
                juniorProfit = juniors * 20;
                seniorProfit = seniors * 21.50;
            }

            totalProfit = (juniorProfit + seniorProfit) - ((juniorProfit + seniorProfit) * 0.05);
            Console.WriteLine($"{totalProfit:f2}");

        }
    }
}