using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _02.Small_Shop
{
    class Program
    {
        static void Main(string[] args)
        {

            string product = Console.ReadLine();
            string town = Console.ReadLine();
            double quantity = double.Parse(Console.ReadLine());

            double cofeeSofia = 0.50;
            double cofeePlovdiv = 0.40;
            double cofeeVarna = 0.45;
            double waterSofia = 0.80;
            double waterPlovdiv = 0.70;
            double waterVarna = 0.70;
            double beerSofia = 1.20;
            double beerPlovdiv = 1.15;
            double beerVarna = 1.10;
            double sweetsSofia = 1.45;
            double sweetsPlovdiv = 1.30;
            double sweetsVarna = 1.35;
            double peanutsSofia = 1.60;
            double peanutsPlovdiv = 1.50;
            double peanutsVarna = 1.55;


            if (town == "Sofia")
            {
                if (product == "coffee")
                {
                    double price = cofeeSofia * quantity;
                    Console.WriteLine(price);

                }
                else if (product == "water")
                {
                    double price = waterSofia * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "beer")
                {
                    double price = beerSofia * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "sweets")
                {
                    double price = sweetsSofia * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "peanuts")
                {
                    double price = peanutsSofia * quantity;
                    Console.WriteLine(price);
                }
            }
            if (town == "Plovdiv")
            {
                if (product == "coffee")
                {
                    double price = cofeePlovdiv * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "water")
                {
                    double price = waterPlovdiv * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "beer")
                {
                    double price = beerPlovdiv * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "sweets")
                {
                    double price = sweetsPlovdiv * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "peanuts")
                {
                    double price = peanutsPlovdiv * quantity;
                    Console.WriteLine(price);
                }

            }
            if (town == "Varna")
            {
                if (product == "coffee")
                {
                    double price = cofeeVarna * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "water")
                {
                    double price = waterVarna * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "beer")
                {
                    double price = beerVarna * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "sweets")
                {
                    double price = sweetsVarna * quantity;
                    Console.WriteLine(price);
                }
                else if (product == "peanuts")
                {
                    double price = peanutsVarna * quantity;
                    Console.WriteLine(price);
                }
            }

        }
    }
}