using System;

namespace _08._Fruit_Shop
{
    class Program
    {
        static void Main(string[] args)
        {
            string fruit = 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")
            {
                if (fruit == "banana")
                {
                    price = 2.50;
Console.WriteLine($"{price * quantity:F2}");
                }

                else if (fruit == "apple")
                {
                    price = 1.20;
Console.WriteLine($"{price * quantity:F2}");
                }

                else if (fruit == "orange")
                {
                    price = 0.85;
Console.WriteLine($"{price * quantity:F2}");
                }

                else if (fruit == " grapefruit")
                {
                    price = 1.45;
Console.WriteLine($"{price * quantity:F2}");
                }
                else if (fruit == "kiwi")
                {
                    price = 2.70;
Console.WriteLine($"{price * quantity:F2}");

                }
                else if (fruit == "pineapple")
                {
                    price = 5.50;
Console.WriteLine($"{price * quantity:F2}");

                }
                else if (fruit == "grapes")
                {
                    price = 3.85;
Console.WriteLine($"{price * quantity:F2}");
                }
				else
                {
                    Console.WriteLine("error");
                }


 }

                else if (day == "Saturday" || day == "Sunday")

 {
                    if (fruit == "banana")
                    {
                        price = 2.70;
Console.WriteLine($"{price * quantity:F2}");
                    }

                    else if (fruit == "apple")
                    {
                        price = 1.25;
Console.WriteLine($"{price * quantity:F2}");
                    }

                    else if (fruit == "orange")
                    {
                        price = 0.90;
Console.WriteLine($"{price * quantity:F2}");
                    }

                    else if (fruit == "grapefruit")
                    {
                        price = 1.60;
Console.WriteLine($"{price * quantity:F2}");
                    }
                    else if (fruit == "kiwi")
                    {
                        price = 3.00;
Console.WriteLine($"{price * quantity:F2}");

                    }
                    else if (fruit == "pineapple")
                    {
                        price = 5.60;
Console.WriteLine($"{price * quantity:F2}");

                    }
                    else if (fruit == "grapes")
                    {
                        price = 4.20;
Console.WriteLine($"{price * quantity:F2}");
                    }
 					else
                {
                    Console.WriteLine("error");
                }

                }






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





            }

        }
}