Main class

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.Locale;
import java.util.Scanner;
import java.util.TreeSet;

import com.sun.org.apache.bcel.internal.generic.NEW;



public class Main {

    public static void main(String[] args) {
        Locale.setDefault(Locale.ROOT);
        double totalSum = 0;
        TreeSet<Product> products = new TreeSet<Product>();
        try {
            Scanner sc = new Scanner(new File("Products.txt"));
            while (sc.hasNext()) {
                products.add(new Product(sc.next(), sc.nextDouble()));
            }
            sc.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            Scanner sc = new Scanner(new File("Order.txt"));
            while (sc.hasNext()) {
                double quantity = sc.nextDouble();
                String productName = sc.next();
                for (Product product : products) {
                    if (product.equals(new Product(productName, 0))) {
                        totalSum += quantity * product.getPrice();
                    }
                }
            }
            sc.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            PrintWriter pw = new PrintWriter(new File("Output.txt"));
            DecimalFormat formatter = new DecimalFormat("#0.00");
            pw.println(formatter.format(totalSum));
            pw.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

    }

}