using System;

namespace FruitShop
{
    class Program
    {
        static void Main(string[] args)
        {

            var fruit = Console.ReadLine();
            var day = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());
            double price;


            if (day == "Monday" || day == "Tuesday" || day == "Wednesday" || day == "Tuesday" || day == "Friday")
            {
                if (fruit == "banana")
                { price = 2.50; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "apple")
                { price = 1.20; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "orange")
                { price = 0.85; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "grapefruit")
                { price = 1.45; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "kiwi")
                { price = 2.70; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "pineapple")
                { price = 5.50; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "grapes")
                { price = 3.85; Console.WriteLine("{0:0.##}", quantity * price); }

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


            else if (day == "Saturday" || day == "Sunday")
            {
                if (fruit == "banana")
                { price = 2.70; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "apple")
                { price = 1.25; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "orange")
                { price = 0.90; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "grapefruit")
                { price = 1.60; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "kiwi")
                { price = 3.00; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "pineapple")
                { price = 5.60; Console.WriteLine("{0:0.##}", quantity * price); }

                else if (fruit == "grapes")
                { price = 4.20; Console.WriteLine("{0:0.##}", quantity * price); }

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

        }
    }
}