using System;

namespace FruitShop
{
    class Program
    {
        static void Main(string[] args)
        {
            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")
                {
                    totalPrice = quantity * priceForbanana;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "apple")
                {
                    totalPrice = quantity * priceForapple;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "orange")
                {
                    totalPrice = quantity * priceFororange;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "grapefruit")
                {
                    totalPrice = quantity * priceForgrapefruit;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "kiwi")
                {
                    totalPrice = quantity * priceForkiwi;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "pineapple")
                {
                    totalPrice = quantity * priceForpineapple;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                 if (fruit == "grapes")
                {
                    totalPrice = quantity * priceForpineapple;
                    Console.WriteLine($"{totalPrice:F2}");
                }


            }
                else if (dayOfweek == "Saturday" || dayOfweek == "Sunday")
                {
                if (fruit == "apple")
                {
                    totalPrice = quantity * priceForappleW;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                if (fruit == "orange")
                {
                    totalPrice = quantity * priceFororangeW;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                if (fruit == "grapefruit")
                {
                    totalPrice = quantity * priceForgrapefruitW;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                if (fruit == "kiwi")
                {
                    totalPrice = quantity * priceForkiwiW;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                if (fruit == "pineapple")
                {
                    totalPrice = quantity * priceForpineappleW;
                    Console.WriteLine($"{totalPrice:F2}");
                }
                if (fruit == "grapes")
                {
                    totalPrice = quantity * priceForgrapes;
                    Console.WriteLine($"{totalPrice:F2}");
                }

            }

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