import sys
input = sys.stdin.readline
N = int(input())
a = list(map(int, input().split()))

if N >= 3:
  if N & 1: print(1)
  else:
    a.sort()
    a.append(a[0] * a[1])
    a = a[2: ]
    a.sort()
    print(a[0])

else:
  res = 1
  for x in a: res *= x
  print(res)