using System;

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

            double price = 0;

            if (dayOfWeek == "Monday")
            {
                if (fruit == "banana")
                {
                    price = 2.5;
                }
                else if (fruit == "apple")
                {
                    price = 1.2;
                }
                else if (fruit == "orange")
                {
                    price = 0.85;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.45;
                }
                else if (fruit == "kiwi")
                {
                    price = 2.7;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.5;
                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
                }
                else

                    Console.WriteLine("error");
            }
            else if (dayOfWeek == "Tuesday")
            {
                if (fruit == "banana")
                {
                    price = 2.5;
                }
                else if (fruit == "apple")
                {
                    price = 1.2;
                }
                else if (fruit == "orange")
                {
                    price = 0.85;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.45;
                }
                else if (fruit == "kiwi")
                {
                    price = 2.7;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.5;
                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
                }
                else
                    Console.WriteLine("error");
            }
            else if (dayOfWeek == "Wednesday")
            {
                if (fruit == "banana")
                {
                    price = 2.5;
                }
                else if (fruit == "apple")
                {
                    price = 1.2;
                }
                else if (fruit == "orange")
                {
                    price = 0.85;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.45;
                }
                else if (fruit == "kiwi")
                {
                    price = 2.7;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.5;
                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
                }
                else
                    Console.WriteLine("error");
            }
            else if (dayOfWeek == "Tuesday")
            {
                if (fruit == "banana")
                {
                    price = 2.5;
                }
                else if (fruit == "apple")
                {
                    price = 1.2;
                }
                else if (fruit == "orange")
                {
                    price = 0.85;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.45;
                }
                else if (fruit == "kiwi")
                {
                    price = 2.7;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.5;
                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
                }
                else
                    Console.WriteLine("error");
            }
            else if (dayOfWeek == "Friday")
            {
                if (fruit == "banana")
                {
                    price = 2.5;
                }
                else if (fruit == "apple")
                {
                    price = 1.2;
                }
                else if (fruit == "orange")
                {
                    price = 0.85;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.45;
                }
                else if (fruit == "kiwi")
                {
                    price = 2.7;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.5;
                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
                }
                else
                    Console.WriteLine("error");
            }
            else if (dayOfWeek == "Saturday")
            {
                if (fruit == "banana")
                {
                    price = 2.7;
                }
                else if (fruit == "apple")
                {
                    price = 1.25;
                }
                else if (fruit == "orange")
                {
                    price = 0.9;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.6;
                }
                else if (fruit == "kiwi")
                {
                    price = 3;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.6;
                }
                else if (fruit == "grapes")
                {
                    price = 4.20;
                }
                else
                Console.WriteLine("error");
            }
            else if (dayOfWeek == "Sunday")
            {
                if (fruit == "banana")
                {
                    price = 2.7;
                }
                else if (fruit == "apple")
                {
                    price = 1.25;
                }
                else if (fruit == "orange")
                {
                    price = 0.9;
                }
                else if (fruit == "grapefruit")
                {
                    price = 1.6;
                }
                else if (fruit == "kiwi")
                {
                    price = 3;
                }
                else if (fruit == "pineapple")
                {
                    price = 5.6;
                }
                else if (fruit == "grapes")
                {
                    price = 4.20;
                }
                else
                    Console.WriteLine("error");
            }
            else
                Console.WriteLine("error");

            if(price == 0.00)
            {
                Console.WriteLine("");
            }
            else
            {
                Console.WriteLine($"{price * quantity:F2}");
            }





        }
    }
}