In the wild, predators such as wolves need prey, such as sheep, to survive. The popillation of the wolves, W, is modeled by W = 3,000 + 1000sin ((pi)/6) and
population of the sheep, S, is modeled by S = 10,000 + 5000cos((pi)/6),
where t is the time in months.

Which month does the wolf population reach its maximum?