using System;

namespace FruitShop
{
    class Program
    {
        static void Main(string[] args)
        {
            //banana	apple	orange	grapefruit	kiwi	pineapple	grapes
            // 2.50	1.20	0.85	1.45	2.70	5.50	3.85
            string fruit = Console.ReadLine();
            string dayOfweek = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            double priceForbanana = 2.50;
            double priceForapple = 1.20;
            double priceFororange = 0.85;
            double priceForgrapefruit = 1.45;
            double priceForkiwi = 2.70;
            double priceForpineapple = 5.50;
            double priceForgrapes = 3.85;

            double priceForbananaW = 2.70;
            double priceForappleW = 1.25;
            double priceFororangeW = 0.90;
            double priceForgrapefruitW = 1.60;
            double priceForkiwiW = 3.00;
            double priceForpineappleW = 5.60;
            double priceForgrapesW = 4.20;
            double totalPrice = 0;
            double totalPrice2 = 0;


            if (dayOfweek == "Monday" || dayOfweek == "Tuesday" || dayOfweek == "Wednesday" || dayOfweek == "Thursday" || dayOfweek == "Friday")

            {
                if (fruit == "banana" || fruit == "apple" || fruit == "orange" || fruit == "grapefruit" || fruit == "kiwi" || fruit == "pineapple" || fruit == "grapes")
                {
                    totalPrice = quantity * priceForapple;
                    totalPrice = quantity * priceForbanana;
                    totalPrice = quantity * priceFororange;
                    totalPrice = quantity * priceForgrapefruit;
                    totalPrice = quantity * priceForkiwi;
                    totalPrice = quantity * priceForpineapple;
                    totalPrice = quantity * priceForgrapes;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                else if (dayOfweek == "Saturday" || dayOfweek == "Sunday")
                {
                            totalPrice2 = quantity * priceForappleW;
                            totalPrice2 = quantity * priceForbananaW;
                            totalPrice2 = quantity * priceFororangeW;
                            totalPrice2 = quantity * priceForgrapefruitW;
                            totalPrice2 = quantity * priceForkiwiW;
                            totalPrice2 = quantity * priceForpineappleW;
                            totalPrice2 = quantity * priceForgrapesW;
                            Console.WriteLine($"{totalPrice2:F2}");
                }
                }
                else
                {
                    Console.WriteLine("error");
                }




            }
         }
    }