SmallShop

namespace SmallShop
{
    using System;

    class SmallShop
    {
        static void Main()
        {
            var product = Console.ReadLine().ToLower();
            var town = Console.ReadLine().ToLower();
            var quantity = double.Parse(Console.ReadLine());
            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(1.2 * quantity);
                }
                else if (product == "sweets")
                {
                    Console.WriteLine(1.45 * quantity);
                }
                else if (product == "peanuts")
                {
                    Console.WriteLine(1.6 * quantity);
                }
            }
            else if (town == "plovdiv")
            {
                if (product == "coffee")
                {
                    Console.WriteLine(0.4 * quantity);
                }
                else if (product == "water")
                {
                    Console.WriteLine(0.7 * 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(1.5 * quantity);
                }
            }
            else if (town == "varna")
            {
                if (product == "coffee")
                {
                    Console.WriteLine(0.45 * quantity);
                }
                else if (product == "water")
                {
                    Console.WriteLine(0.7 * quantity);
                }
                else if (product == "beer")
                {
                    Console.WriteLine(1.1 * quantity);
                }
                else if (product == "sweets")
                {
                    Console.WriteLine(1.35 * quantity);
                }
                else if (product == "peanuts")
                {
                    Console.WriteLine(1.55 * quantity);
                }
            }
        }
    }
}