import sys
input = sys.stdin.readline

N=int(input())
A=list(map(lambda x:int(x),input().split()))
A.sort()
if N==1:
    print(A[0])
elif N==2:
    print(A[0]*A[1])
elif N%2==0:
    print(min(A[2], A[0]*A[1]))
else:
    print(1)