The Performance Awards shall vest and become nonforfeitable with respect to thirty-three percent (33%) of the total number of Performance Awards on the first Installment Vesting Date, thirty-three percent (33%) of the total number of Performance Awards on the second Installment Vesting Date and thirty-four percent (34%) of the total number of Performance Awards on the last Installment Vesting Date; provided, however, that the final number of Performance Awards shall be determined only upon completion of the Performance Period as contemplated by Section 3(b).  Except as otherwise provided in this Agreement, the first Installment Vesting Date shall be December 31, 2017, the second Installment Vesting Date shall be December 31, 2018 and the last Installment Date Vesting Date shall be December 31, 2019 (each an “ Installment Vesting Date ”).