bike race

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace silvanadoc
{
    class silvanadoc
    {
        static void Main(string[] args)
        {
            int junior = int.Parse(Console.ReadLine());
            int senior = int.Parse(Console.ReadLine());
            string trace = Console.ReadLine();
            int people = junior + senior;



            if (trace == "trail")
            {
                var money = ((junior * 5.5) + (senior * 7)) * 0.95;
                Console.WriteLine($"{money:f2}");
            }
            else if (trace == "cross-country")
            {
                if (people >= 50)
                {
                    var money = (((junior * 8) + (senior * 9.5)) * 0.75) * 0.95;
                    Console.WriteLine($"{money:f2}");
                }
                else
                {
                    var money = ((junior * 8) + (senior * 9.50)) * 0.95;
                    Console.WriteLine($"{money:f2}");
                }
            }
            else if (trace == "downhill")
            {
                var money = ((junior * 12.25) + (senior * 13.75)) * 0.95;
                Console.WriteLine($"{money:f2}");
            }
            else if (trace == "road")
            {
                var money = ((junior * 20) + (senior * 21.5)) * 0.95;
                Console.WriteLine($"{money:f2}");
            }





        }

    }
}