import sys
input = sys.stdin.readline

N=int(input())
A=list(map(int,input().split()))

if N==1:
    print(A[0])
elif N==2:
    print(A[0]*A[1])
elif N%2==1:
    print(1)
elif 1 in A:
    print(1)
else:
    A.sort()
    B=A[2:]+[A[0]*A[1]]
    print(min(B))