using System;

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

            var typeFrut = Console.ReadLine().ToLower();
            var dayWeek = Console.ReadLine().ToLower();
            var quantity = double.Parse(Console.ReadLine());

            var price = 0.0;

      
            if (dayWeek == "monday" || dayWeek == "tuesday" || dayWeek == "wednesday" 
                      || dayWeek == "thursday" || dayWeek == "friday")
            {
                if (typeFrut == "banana")
                    price = 2.50;
                else if (typeFrut == "apple")
                    price = 1.20;
                else if (typeFrut == "orange")
                    price = 0.85;
                else if (typeFrut == "grapefruit")
                    price = 1.45;
                else if (typeFrut == "kiwi")
                    price = 2.70;
                else if (typeFrut == "pineapple")
                    price = 5.50;
                else if (typeFrut == "grapes")
                    price = 3.85;
                else
                    Console.WriteLine("error");

            }
            else if (dayWeek == "saturday" || dayWeek == "sunday")
            {
                if (typeFrut == "banana")
                    price = 2.70;
                else if (typeFrut == "apple")
                    price = 1.25;
                else if (typeFrut == "orange")
                    price = 0.90;
                else if (typeFrut == "grapefruit")
                    price = 1.60;
                else if (typeFrut == "kiwi")
                    price = 3.00;
                else if (typeFrut == "pineapple")
                    price = 5.60;
                else if (typeFrut == "grapes")
                    price = 4.20;
                else
                    Console.WriteLine("error");
            }
            else
            {
                Console.WriteLine("error");
            }
           if (price == 0.0)
            {
            }
           else
            {
             Console.WriteLine("{0:F2}", price * quantity);
            }
               
           
            

          
        }
    }
}