using System;
					
public class Program
{
	public static void Main()
	{
		 var type = Console.ReadLine().ToLower();
            var r = int.Parse(Console.ReadLine());
            var c = int.Parse(Console.ReadLine());

            var price = 0.0;

            if (type == "premiere")
            {
                price = 12.00;
            }
            else if (type == "normal")
            {
                price = 7.50;
            }
            else if (type == "discount")
            {
                price = 5.00;
            }
            Console.WriteLine("{0:f2} ", (c * r) * price);
	}
}