def read_data():
    N = int(input())
    A = list(map(int, input().split()))
    return N, A

def solve(N, A):
    A = list(set(A))
    index = 1 << 61
    for rank in range(61):
        A.sort(reverse=True)
        if rank >= len(A):
            break
        Ar = A[rank]
        if Ar == 0:
            break
        while index and not Ar & index:
            index >>= 1
        i = rank + 1
        while i < len(A) and A[i] & index:
            A[i] ^= Ar
            i += 1
    return 1 << rank

N, A = read_data()
print(solve(N, A))