EXHIBIT 1

CUSIP No. H01531104

AGREEMENT CONCERNING JOINT FILING

OF SCHEDULE 13D

The undersigned agree as follows:

(i) each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and

(ii) each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other person making the filing, unless such person knows or has reason to believe that such information is inaccurate.

This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all of which, taken together, shall constitute one and the same instrument.

Dated: July 14, 2017

	V. PREM WATSA


	/s/ V. Prem Watsa

	1109519 ONTARIO LIMITED


	By:	/s/ V. Prem Watsa
		Name: V. Prem Watsa
		Title: President

	THE SIXTY TWO INVESTMENT COMPANY LIMITED


	By:	/s/ V. Prem Watsa
		Name: V. Prem Watsa
		Title: President

	810679 ONTARIO LIMITED


	By:	/s/ V. Prem Watsa
		Name: V. Prem Watsa
		Title: President

	FAIRFAX FINANCIAL HOLDINGS LIMITED


	By:	/s/ Paul Rivett
		Name: Paul Rivett
		Title: President

	1102952 B.C. UNLIMITED LIABILITY COMPANY


	By:	/s/ John Varnell
		Name: John Varnell
		Title: Director

	FAIRFAX FINANCIAL HOLDINGS (SWITZERLAND) GMBH


	By:	/s/ Ronald Schokking
		Name: Ronald Schokking
		Title: Chairman of the Managing Board


	FAIRFAX (SWITZERLAND) GMBH


	By:	/s/ Ronald Schokking
		Name: Ronald Schokking
		Title: Chairman of the Managing Board

Allied World Assurance Co Holdings, AG SC 13D