using System;

public class Program

{

    public static void Main()

    {

        string type = Console.ReadLine();

        int r = int.Parse(Console.ReadLine());

        int c = int.Parse(Console.ReadLine());

        int h = r*c;

        double p = 0.0;

        if (type == "premiera")

        {

            p = 12*h;

        }

        else if (type == "normal")

        {

            p = h*7.50;

        }

        else if (type == "discount")

        {

            p = h*5;

        }

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

    }

}