import java.io.PrintStream;

import type.lib.CreditCard;
import type.lib.GlobalCredit;

public class PrintBalance
{
    public static void main(String[] args)
    {
	PrintStream output = System.out;

	GlobalCredit company = GlobalCredit.getRandom();
	double balance = 0;
	for (CreditCard card : company)
	{
	    balance += card.getBalance();
	}
	output.printf("%.2f%n", balance);
    }
}