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)
else:
    A.sort()
    A = sorted(A[2:]+[A[0]*A[1]])
    print(A[0])