using System;

namespace P11FruitShop
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 1. Read the input from the user
            // - Fruit 'text' (string)
            // - Day from the week 'text' (string)
            // - Quantity 'real number' (double)
            // - Make veriable that contain total sum 'real number' (double)

            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double qty = double.Parse(Console.ReadLine());
            double totalSum = 0;

            // - Fruit prices in working day
            //плод	banana	 apple	 orange	 grapefruit	 kiwi	 pineapple	grapes
            //цена    2.50    1.20    0.85    1.45       2.70    5.50       3.85

            // - Fruit prices trough weekend
            //плод	banana	 apple	orange	grapefruit	kiwi	pineapple	grapes
            //цена    2.70    1.25    0.90    1.60      3.00       5.60      4.20

            switch (day)
            {
                case "Monday":
                case "Tuesday":
                case "Wednesday":
                case "Thursday":
                case "Friday":
                    switch (fruit)
                    {
                        case "banana":
                            totalSum = qty * 2.50;
                            break;
                        case "apple":
                            totalSum = qty * 1.20;
                            break;
                        case "orange":
                            totalSum = qty * 0.85;
                            break;
                        case "grapefruit":
                            totalSum = qty * 1.45;
                            break;
                        case "kiwi":
                            totalSum = qty * 2.70;
                            break;
                        case "pineapple":
                            totalSum = qty * 5.50;
                            break;
                        case "grapes":
                            totalSum = qty * 3.85;
                            break;
                        default:
                            Console.WriteLine("error");
                            break;
                    }
                    break;

                case "Saturday":
                case "Sunday":
                    switch (fruit)
                    {
                        case "banana":
                            totalSum = qty * 2.70;
                            break;
                        case "apple":
                            totalSum = qty * 1.25;
                            break;
                        case "orange":
                            totalSum = qty * 0.90;
                            break;
                        case "grapefruit":
                            totalSum = qty * 1.60;
                            break;
                        case "kiwi":
                            totalSum = qty * 3.00;
                            break;
                        case "pineapple":
                            totalSum = qty * 5.60;
                            break;
                        case "grapes":
                            totalSum = qty * 4.20;
                            break;
                        default:
                            Console.WriteLine("error");
                            break;

                    }
                    break;

                default:
                    Console.WriteLine("error");
                    break;


            }

            Console.WriteLine($"{totalSum:f2}");

        }
    }
}