SmallShop

import java.util.Scanner;

public class SmallShop {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String prod = scanner.nextLine().toLowerCase();
        String city = scanner.nextLine().toLowerCase();
        double col = Double.parseDouble(scanner.nextLine());
        double price = 0;

        if ("Sofia".equals(city)) {
            if ("coffee".equals(prod)) {
                price = 0.5;
            } else if ("water".equals(prod)) {
                price = 0.8;
            } else if ("beer".equals(prod)) {
                price = 1.2;
            } else if ("sweets".equals(prod)) {
                price = 1.45;
            } else if ("peanuts".equals(prod)) {
                price = 1.6;
            } else if ("Plovdiv".equals(city)) ;
            else if ("coffee".equals(prod)) {
                price = 0.4;
            } else if ("water".equals(prod)) {
                price = 0.7;
            } else if ("beer".equals(prod)) {
                price = 1.15;
            } else if ("sweets".equals(prod)) {
                price = 1.3;
            } else if ("peanuts".equals(prod)) {
                price = 1.5;
            } else if ("Varna".equals(city)) {
             if ("coffee".equals(prod)) {
                price = 0.5;
            } else if ("water".equals(prod)) {
                price = 0.8;
            } else if ("beer".equals(prod)) {
                price = 1.2;
            } else if ("sweets".equals(prod)) {
                price = 1.45;
            } else if ("peanuts".equals(prod)) {
                price = 1.6;
            }

        }

    } double result =price * col;
        System.out.println(result);

}}