using System;

namespace Fruit_Shop
{
    class Program
    {
        static void Main(string[] args)
        {
            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            if (day == "Monday" || day == "Tuesday" || day == "Wednesday" || day == "Thursday" || day == "Friday")
            {
                if (fruit == "banana")
                {
                    Console.WriteLine("{0:f2}", 2.50 * quantity);

                }
                if (fruit == "apple")
                {
                    Console.WriteLine("{0:f2}", 1.20 * quantity);
                }
                if (fruit == "orange")
                {
                    Console.WriteLine("{0:f2}", 0.85 * quantity);
                }
                if (fruit == "grapefruit")
                {
                    Console.WriteLine("{0:f2}", 1.45 * quantity);
                }
                if (fruit == "kiwi")
                {
                    Console.WriteLine("{0:f2}", 2.70 * quantity);
                }
                if (fruit == "pineapple")
                {
                    Console.WriteLine("{0:f2}", 5.50 * quantity);
                }
                if (fruit == "grapes")
                {
                    Console.WriteLine("{0:f2}", 3.85 * quantity);
                }


            }

            else if (day == "Saturday" || day == "Sunday")
            {
                if (fruit == "banana")
                {
                    Console.WriteLine("{0:f2}", 2.70 * quantity);
                }
                if (fruit == "apple")
                {
                    Console.WriteLine("{0:f2}", 1.25 * quantity);
                }
                if (fruit == "orange")
                {
                    Console.WriteLine("{0:f2}", 0.90 * quantity);
                }
                if (fruit == "grapefruit")
                {
                    Console.WriteLine("{0:f2}", 1.60 * quantity);
                }
                if (fruit == "kiwi")
                {
                    Console.WriteLine("{0:f2}", 3.00 * quantity);
                }
                if (fruit == "pineapple")
                {
                    Console.WriteLine("{0:f2}", 5.60 * quantity);
                }
                if (fruit == "grapes")
                {
                    Console.WriteLine("{0:f2}", 4.20 * quantity);
                }
            }

            else
            {
                Console.WriteLine("error");
            }











        }
    }
}