using System;

class SmallShop
{
    static void Main()
    {
        string productName = Console.ReadLine().ToLower();
        string town = Console.ReadLine();
        double quantity = double.Parse(Console.ReadLine());

        if (town == "Sofia")
        {
            if (productName == "coffee")
            {
                quantity *= 0.50;
            }
            else if (productName == "water")
            {
                quantity *= 0.80;
            }
            else if (productName == "beer")
            {
                quantity *= 1.20;
            }
            else if (productName == "sweets")
            {
                quantity *= 1.45;
            }
            else if (productName == "peanuts")
            {
                quantity *= 1.60;
            }

        }
        if (town == "Plovdiv")
        {
            if (productName == "coffee")
            {
                quantity *= 0.40;
            }
            else if (productName == "water")
            {
                quantity *= 0.70;
            }
            else if (productName == "beer")
            {
                quantity *= 1.15;
            }
            else if (productName == "sweets")
            {
                quantity *= 1.30;
            }
            else if (productName == "peanuts")
            {
                quantity *= 1.50;
            }
        }
        if (town == "Varna")
        {
            if (productName == "coffee")
            {
                quantity *= 0.45;
            }
            else if (productName == "water")
            {
                quantity *= 0.70;
            }
            else if (productName == "beer")
            {
                quantity *= 1.10;
            }
            else if (productName == "sweets")
            {
                quantity *= 1.35;
            }
            else if (productName == "peanuts")
            {
                quantity *= 1.55;
            }
        }
        Console.WriteLine(quantity);
    }
}