July
Album X Album Y Album Z
Outlet A 14 8 6
Outlet B 7 13 4
Outlet C 2 11 1

August
Album X Album Y Album Z
Outlet A 12 14 10
Outlet B 5 12 8
Outlet C 16 12 7

The two tables show the number of copies of albums X, Y, and Z sold in outlets A, B, and C of a company.
The total number of copies of album Z sold by outlet C in July and August is
.