using System;

class Program
{
    public static void Main(string[] args)
    {
        string product = Console.ReadLine();
        double quantity = double.Parse(Console.ReadLine());
        double result= Money(product, quantity);
        Console.WriteLine($"{result:f2}");
    }
    public static double Money(string st,double d)
    {
        double totalprice = 0.00;
        if (st == "coffee")
        {
            totalprice= d * 1.50;
        }
        else if (st == "coke")
        {
           totalprice= d * 1.40;
        }
        else if(st=="water")
        {
          totalprice= d * 1.00;
        }
        else if(st== "snacks")
        {
           totalprice = d * 2.00;
        }
        return totalprice;
    }
}