Today, Tiffany is starting to save up for a downpayment on a house. Currently she has $571 in an account earning 6% semiannually. She will deposit $160 at the beginning of every two weeks for four years. After an additional six months (4.5 years from today), Tiffany pays the downpayment of $15,000 for her new home. What balance is remaining in this account?