The amount of the unified pension payable to an employee, former employee or survivor shall be the sum of:
(1) The amount computed according to this chapter exclusive of service credited under § 5501(e)(14) of this title; plus
(2) The sum of the amounts computed, based on credited service as an employee, according to subchapter II of Chapter 55A of this title; subchapter III of Chapter 83 of Title 11; and Chapter 88 of Title 11; and, the amount computed based on credited service as a member, according to Chapter 56 of this title.