using System;

namespace _08.FruitShop
{
    class Program
    {
        static void Main(string[] args)
        {
            string typeFruit = Console.ReadLine();
            string day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());


            double price = 0;
            if (day == "Monday" || day == "Tuesday" || day == "Wednesday" || day == "Thursday" || day == "Friday")
            {

                switch (typeFruit)
                {
                    case "banana":
                        price = 2.50;
                        break;
                    case "apple":
                        price = 1.20;
                        break;
                    case "orange":
                        price = 0.85;
                        break;
                    case "grapefruit":
                        price = 1.45;
                        break;
                    case "kiwi":
                        price = 2.70;
                        break;
                    case "pineapple":
                        price = 5.50;
                        break;
                    case "grapes":
                        price = 3.85;
                        break;
                }
            }
            else if (day == "Saturday" || day == "Sunday")
            {
                switch (typeFruit)
                {
                    case "banana":
                        price = 2.70;
                        break;
                    case "apple":
                        price = 1.25;
                        break;
                    case "orange":
                        price = 0.90;
                        break;
                    case "grapefruit":
                        price = 1.60;
                        break;
                    case "kiwi":
                        price = 3.00;
                        break;
                    case "pineapple":
                        price = 5.60;
                        break;
                    case "grapes":
                        price = 4.20;
                        break;
                }
            }
            else
            {
                Console.WriteLine("error");
            }

            if (price != 0 )
            {
                double total = price * quantity;
                Console.WriteLine($"{total:F2}");
            }
            else
            {
                Console.WriteLine("error");
            }

        }
    }
}