SmallShop

using System;


class Program
{
    static void Main()
    {
        string product = Console.ReadLine().ToLower(), town = Console.ReadLine().ToLower();
        float quantity = float.Parse(Console.ReadLine());
        /*град / продукт coffee  water   beer    sweets  peanuts

        Sofia               0.50    0.80    1.20    1.45    1.60
        Plovdiv             0.40    0.70    1.15    1.30    1.50
        Varna               0.45    0.70    1.10    1.35    1.55*/

        if (town == "sofia")
        {
            if (product == "coffee")
            {
                Console.WriteLine(0.50 * quantity);
            }
            else if (product == "water")
            {
                Console.WriteLine(0.80 * quantity);
            }
            else if (product == "beer")
            {
                Console.WriteLine(1.20 * quantity);
            }
            else if (product == "sweets")
            {
                Console.WriteLine(1.45 * quantity);
            }
            else if (product == "peanuts")
            {
                Console.WriteLine(1.60 * quantity);
            }

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