Bond A has a coupon rate of 12.69 percent, a yield-to-maturity of 13.22 percent, and a face value of 1,000 dollars; matures in 15 years; and pays coupons annually with the next coupon expected in 1 year. What is (X + Y + Z) if X is the present value of any coupon payments expected to be made in 6 years from today, Y is the present value of any coupon payments expected to be made in 12 years from today, and Z is the present value of any coupon payments expected to be made in 18 years from today?