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

namespace _03.Mobile_operator
{
    class Program
    {
        static void Main(string[] args)
        {
            string contract = Console.ReadLine();
            string typeContract = Console.ReadLine();
            string internet = Console.ReadLine();
            var month = int.Parse(Console.ReadLine());

            var sum = 0.0;

            if (contract == "one")
            {
                if (typeContract == "Small")
                {
                    sum = 9.98;
                }
                else if (typeContract == "Middle")
                {
                    sum = 18.99;
                }
                else if (typeContract == "Large")
                {
                    sum = 25.98;
                }
                else if (typeContract == "ExtraLarge")
                {
                    sum = 35.99;
                }
            }
            else if (internet == "yes")
            {
                if (sum <= 10)
                {
                    sum += 5.50;
                }
                else if (sum >=10 && sum <= 30)
                {
                    sum += 4.35;
                }
                else if (sum > 30)
                {
                    sum += 3.85;
                }
            }
            else if (contract == "two")
            {
                if (typeContract == "Small")
                {
                    sum = 8.58;
                }
                else if (typeContract == "Middle")
                {
                    sum = 17.09;
                }
                else if (typeContract == "Large")
                {
                    sum = 23.59;
                }
                else if (typeContract == "ExtraLarge")
                {
                    sum = 31.79;
                }
            }
            else if (internet == "yes")
            {
                if (sum <= 10)
                {
                    sum += 5.50;
                }
                else if (sum >= 10 && sum <= 30)
                {
                    sum += 4.35;
                }
                else if (sum > 30)
                {
                    sum += 3.85;

                }

            }
            sum *= 1 - 0.0375;

            var fullSum = sum * month;
            Console.WriteLine("{0:f2} lv.",fullSum);
        }
    }
}