n = int(input())
A = list(map(int, input().split()))
A.sort()

if n == 1:
    print(A[0])
elif n == 2:
    print(A[0]*A[1])
else:
    if n%2 == 1:
        print(1)
    else:
        ans = min(A[0]*A[1], A[2])
        print(ans)