Please explain the calculation procedure of this problem. What is the meaning of the parentheses? (I don't want Excel sheets! I want to know how to calculate this problem!

How much should Brooke Atherton put into an account today that cam period. to be able to withdraw $450 annually for 5 years starting at t=2, then $7.3 percent per year if he wants then $5000 annually for the next 8 years, and then $8500 annull $700 annually for the next 6 years, a. $35,106.27 b. $10,705.61 NP (7.3,0,{0,450,700,5000,8500},{1,5,6,8,15})