class BankAccount {
	private class Money {
		private String currency; // e.g. "HKD", "RMB", "NTD", "JPY", "KRW", "USD", "GBP"
		private double value;

		public Money(String c, double b) {
			currency = c;
			value = b;
		}

		@Override
		public String toString() {
			return currency + " " + value;
		}
	}

	private Money balance;

	public BankAccount(String currency) {
		balance = new Money(currency, 0.0);
	}

	public String getBalance() {
		return balance.toString();
	}

	public void addMoney(double incr) {
		balance.value += incr;
	}
}