from heapq import *

N = int(input())
A = list(map(int, input().split()))
heapify(A)
if N == 1:
    print(A[0])
    exit()
elif N == 2:
    print(A[0] * A[1])
    exit()
elif N % 2:
    print(1)
    exit()
for i in range(N//2 - 1):
    a = heappop(A)
    b = heappop(A)
    if i % 2 == 0:
        heappush(A, a * b)
print(A[0])