using System;

namespace fruit_shop
{
    class Program
    {
        static void Main(string[] args)
        {
            string fruit = Console.ReadLine();
            string day = Console.ReadLine();
            double kg = double.Parse(Console.ReadLine());
            double price = 0;
            double total = 0;

            if (day == "Sunday" || day == "Saturday")
            {
                switch (fruit)
                {

                    case "banana":
                        price = 2.70;
                        break;

                    case "apple":
                        price = 1.25;
                        break;

                    case "orange":
                        price = 0.9;
                        break;

                    case "grapefruit":
                        price = 1.60;
                        break;

                    case "kiwi":
                        price = 3;
                        break;

                    case "pineapple":
                        price = 5.6;
                        break;

                    case "grapes":
                        price = 4.20;
                        break;

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


            else
            {
                if (day == "Monday" || day == "Tuesday" || day == "Wednesday" || day == "Thursday" || day == "Friday")
                switch (fruit)
                {

                    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 = 2.7;
                        break;

                    case "pineapple":
                        price = 5.5;
                        break;

                    case "grapes":
                        price = 3.85;
                        break;

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

        }

                if (price > 0)
                {
                    total = price * kg;
                    Console.WriteLine($"{total:f2}");
                }
            }
        }
    }