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

namespace vacantion
{
    class Program
    {
        static void Main(string[] args)

        {
            var old = int.Parse(Console.ReadLine());
            var junior = int.Parse(Console.ReadLine());
            var nights = int.Parse(Console.ReadLine());
            var transport = Console.ReadLine();
            var oldprice = 0.00;
            var juniorprice = 0.00;
            var allgroup = old + junior;
            var priceallgroupnight = 82.99;

            switch (transport)
            {
                case "train":

                    if (allgroup >= 50)
                    {
                        oldprice = 24.99 * 0.50;
                        juniorprice = 14.99 * 0.50;
                    }
                    else
                    {
                        oldprice = 24.99;
                        juniorprice = 14.99;
                    }

                    break;

                case "bus":

                    oldprice = 32.50;
                    juniorprice = 28.50;

                    break;

                case "boat":

                    oldprice = 42.99;
                    juniorprice = 39.99;

                    break;

                case "airplane":

                    oldprice = 70.00;
                    juniorprice = 50.00;

                    break;


            }

            var transportoneside = oldprice * oldprice + junior * juniorprice;

            var transporttwoside = transportoneside * 2;
            var pricepernight = nights * priceallgroupnight;
            var komisionna = (transporttwoside + pricepernight) * 0.10;
            var allsum = transporttwoside + pricepernight + komisionna;

            Console.WriteLine("{0:F2}", allsum);
            Console.ReadLine();

        }
    }
}