N = int(input())
A = list(set(map(int, input().split())))
N = len(A)
rank = 0
Ar = max(A)
while Ar:
    rank += 1
    index = 1 << (len(bin(Ar)) - 3)
    for i in range(N):
        if A[i] & index:
            A[i] ^= Ar
    Ar = max(A)
print(1 << rank)