Bond A has a coupon rate of 10.16 percent, a yield to maturity of 4.87 percent, and a face value of 1000 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 remade in 6 years from today, Y is the present value of any coupon payments expected to be made in 8 years from today, and Z is the present value of any coupon payments expected to be made in 18 years from today?