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

namespace Project1
{
    class Program
    {
        static void Main(string[] args)
        {
            var siniors = int.Parse(Console.ReadLine());
            var students = int.Parse(Console.ReadLine());
            var nights = int.Parse(Console.ReadLine());
            string transport = Console.ReadLine();

            var siniorTax = 0.00;
            var studentsTax = 0.00;

            switch (transport)
            {
                case "train":
                    siniorTax = 24.99;
                    studentsTax = 14.99;
                    if (siniors + students >= 50)
                    {
                        siniorTax = 24.99 * 0.75;
                        studentsTax =14.99 * 0.75;
                    }
                    else
                    {
                        siniorTax = 24.99;
                        studentsTax = 14.99;
                    }
                    break;
                case "bus":
                    siniorTax = 32.50;
                    studentsTax = 28.50;
                    break;
                case "ship":
                    siniorTax = 42.99;
                    studentsTax = 39.99;
                    break;
                case "plane":
                    siniorTax = 70.00;
                    studentsTax = 50.00;
                    break;
            }
            var transportRazhod = siniors * siniorTax + students * studentsTax;
            var hotel = nights * 82.99;
            var commisiona = (transportRazhod + hotel) * 0.10;
            var summ = transportRazhod + hotel + commisiona;

            Console.WriteLine("{0:f2}", summ);
        }
    }
}