import heapq

n = int(input())
A = list(map(int, input().split()))
A = [-a for a in A]
heapq.heapify(A)
b = 1
while len(A) > 1:
    a1 = -heapq.heappop(A)
    a2 = -heapq.heappop(A)
    if b:
        heapq.heappush(A, -a1 * a2)
    else:
        heapq.heappush(A, -1)
    b = not b
    # print(a1, a2, A[0])


print(-A[0])