using System;

public class Program

{

    public static void Main()

    {

        string productName = Console.ReadLine();

        string town = Console.ReadLine();

        int quantity  = int.Parse(Console.ReadLine());

        double price = 0;

            if (town == "Sofia")

            {

                if (productName == "coffee")

                    price = quantity * 0.50;

                else if (productName == "water")

                    price= quantity * 0.80;

                else if (productName == "beer")

                price = quantity * 1.20;

                else if (productName == "sweets")

                    price = quantity * 1.45;

                else 

                    price = quantity * 1.60;

            }

        else if (town == "Plovdiv")

            if (productName == "coffee")

                    price = quantity * 0.40;

                else if (productName == "water")

                    price= quantity * 0.70;

                else if (productName == "beer")

                price = quantity * 1.15;

                else if (productName == "sweets")

                    price = quantity * 1.30;

                else

                    price = quantity * 1.50;

            else if (town == "Varna")

            {

         if (productName == "coffee")

                    price = quantity * 0.45;

                else if (productName == "water")

                    price= quantity * 0.70;

                else if (productName == "beer")

                price = quantity * 1.10;

                else if (productName == "sweets")

                    price = quantity * 1.35;

                else 

                    price = quantity * 1.55;

            }

        else

        {

            Console.WriteLine("Fals town");

        }

        Console.WriteLine(price);

    }

}