N=int(input())
A=[int(x) for x in input().split()]
if max(A)==1:
    print(1)
elif N==1:
    print(A[0])
elif N==2:
    print(A[0]*A[1])
else:
    A.sort()
    if A[0]*A[1]==A[-1]:
        if N%2==0:
            print(A[-1])
        else:
            print(1)