SmallShop

using System;

class SmallShop
{
    static void Main(string[] args)
    {
        string productName = (Console.ReadLine());
        string townName = (Console.ReadLine());
        double quantity = double.Parse(Console.ReadLine());

        double productPrice = 0;
        if (productName == "coffee")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 0.5;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 0.4;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 0.45;
            }
        }
        else if (productName == "water")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 0.8;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 0.7;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 0.7;
            }
        }
        else if (productName == "beer")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 1.2;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 1.15;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 1.1;
            }
        }
        else if (productName == "water")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 0.8;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 0.7;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 0.7;
            }
        }
        else if (productName == "sweets")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 1.45;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 1.3;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 1.35;
            }
        }
        else if (productName == "peanuts")
        {
            if (townName == "Sofia")
            {
                productPrice = quantity * 1.6;
            }
            else if (townName == "Plovdiv")
            {
                productPrice = quantity * 1.5;
            }
            else if (townName == "Varna")
            {
                productPrice = quantity * 1.55;
            }
        }
        Console.WriteLine(productPrice);
    }
}