using System;

public class Program
{
	public static void Main()
	{
		string fruit = Console.ReadLine();
		string day = Console.ReadLine();
		double count = double.Parse(Console.ReadLine());

		double price = 0;
		double total = 0;

		if ( day == "Monday" || day == " Tuesday"  || day == "Wednesday" || day == "Thursday" || day == "Friday")
		{
		 switch (fruit)
		 {
			 case "banana":
				 price = 2.50;
				 total = price*count;
				 break;

			 case "apple":
				 price = 1.20;
				 total = price*count;
				 break;
			 case "orange":
				 price = 0.85;
				 total = price*count;
				 break;
			 case "grapefruit":
				 price = 1.45;
				 total = price*count;
				 break;
			 case "kiwi":
				 price = 2.70;
				 total = price*count;
				 break;

			 case "pineapple":
				 price = 5.50;
				 total = price*count;
				 break;

			 case "grapes":
				 price = 3.85;
				 total = price*count;
				 break;
				 	Console.WriteLine("{0:f2}", total);
		 }

		}
		if (day =="Saturday" || day== "Sunday")
		{
				 switch (fruit)
		 {
			 case "banana":
				 price = 2.70;
				 total = price*count;
				 break;

			 case "apple":
				 price = 1.25;
				 total = price*count;
				 break;
			 case "orange":
				 price = 0.90;
				 total = price*count;
				 break;
			 case "grapefruit":
				 price = 1.60;
				 total = price*count;
				 break;
			 case "kiwi":
				 price = 3.0;
				 total = price*count;
				 break;

			 case "pineapple":
				 price = 5.60;
				 total = price*count;
				 break;

			 case "grapes":
				 price = 4.20;
				 total = price*count;
				 break;
						 	Console.WriteLine("{0:f2}", total);
		 }



		}

	}
}