MobileOperator

namespace MobileOperator
{
    using System;

    class MobileOperator
    {
        static void Main()
        {
            string term = Console.ReadLine().ToLower();
            string type = Console.ReadLine().ToLower();
            string internet = Console.ReadLine().ToLower();
            int n = int.Parse(Console.ReadLine());

            double monthlyFee = 0;

            if (term == "one")
            {
                if (type == "small") { monthlyFee = 9.98; }
                if (type == "middle") { monthlyFee = 18.99; }
                if (type == "large") { monthlyFee = 25.98; }
                if (type == "extralarge") { monthlyFee = 35.99; }
            }
            else
            {
                if (type == "small") { monthlyFee = 8.58; }
                if (type == "middle") { monthlyFee = 17.09; }
                if (type == "large") { monthlyFee = 23.59; }
                if (type == "extralarge") { monthlyFee = 31.79; }
            }

            if (internet == "yes")
            {
                monthlyFee +=
                    monthlyFee <= 10 ? 5.50 :
                    monthlyFee <= 30 ? 4.35 :
                    3.85;
            }

            if (term == "two") { monthlyFee *= (1 - 0.0375); }

            Console.WriteLine($"{monthlyFee * n:F2} lv.");
        }
    }
}