using System;

public class Program

{

    public static void Main()

    {

        var movieType = Console.ReadLine().ToLower();

        var rows = int.Parse(Console.ReadLine());

        var cols = int.Parse(Console.ReadLine());

        double price = 0;

        if (movieType == "premiere")

        {

            price = 12.00;

        }

        else if (movieType == "normal")

        {

            price = 7.50;

        }

        else if (movieType == "discount")

        {

            price = 5.00;

        }

        int fullHall = rows * cols;

        double profit = fullHall * price;

        Console.WriteLine("{0:f2}", profit);

    }

}