using System;

namespace Shop2
{
    class Program
    {
        static void Main(string[] args)
        {
            //            Магазин за плодове през работните дни работи на следните цени:
            //            плод banana  apple orange  grapefruit kiwi    pineapple grapes
            //           цена  2.50    1.20  0.85    1.45       2.70    5.50      3.85
            //Събота и неделя магазинът работи на по - високи цени:
            //            плод banana  apple orange  grapefruit kiwi    pineapple grapes
            //цена             2.70    1.25    0.90    1.60    3.00    5.60    4.20
            string fruits = Console.ReadLine();
            string day = Console.ReadLine();
            double kolichestvo = double.Parse(Console.ReadLine());

            if (day == "Monday" || day == "Tuesday" || day == "Wednesday" || day == "Thursday" || day == "Friday")
            {
                if (fruits == "banana")
                {
                    Console.WriteLine($"{kolichestvo * 2.50:F2}");
                }
                else if (fruits == "apple")
                {
                    Console.WriteLine($"{kolichestvo * 1.20:F2}");
                }
                else if (fruits == "orange")
                {
                    Console.WriteLine($"{kolichestvo * 0.85:F2}");
                }
                else if (fruits == "grapefruit")
                {
                    Console.WriteLine($"{kolichestvo * 1.45:F2}");
                }
                else if (fruits == "kiwi")
                {
                    Console.WriteLine($"{kolichestvo * 2.70:F2}");
                }
                else if (fruits == "pineapple")
                {
                    Console.WriteLine($"{kolichestvo * 5.50:F2}");
                }
                else if (fruits == "grapes")
                {
                    Console.WriteLine($"{kolichestvo * 3.85:F2}");
                }
				else {
					Console.WriteLine("Error");
				}
            }
            else if (day == "Saturday" || day == "Sunday")
            {
                if (fruits == "banana")
                {
                    Console.WriteLine($"{kolichestvo * 2.70:F2}");
                }
                else if (fruits == "apple")
                {
                    Console.WriteLine($"{kolichestvo * 1.25:F2}");
                }
                else if (fruits == "orange")
                {
                    Console.WriteLine($"{kolichestvo * 0.90:F2}");
                }
                else if (fruits == "grapefruit")
                {
                    Console.WriteLine($"{kolichestvo * 1.60:F2}");
                }
                else if (fruits == "kiwi")
                {
                    Console.WriteLine($"{kolichestvo * 3.00:F2}");
                }
                else if (fruits == "pineapple")
                {
                    Console.WriteLine($"{kolichestvo * 5.60:F2}");
                }
                else if (fruits == "grapes")
                {
                    Console.WriteLine($"{kolichestvo * 4.20:F2}");
                }else {
					Console.WriteLine("Error");
				}
            }
            else
            {
                Console.WriteLine("Error");
            }
        }
    }
}