import sys,random,bisect
from collections import deque,defaultdict,Counter
from heapq import heapify,heappop,heappush
from itertools import cycle, permutations
from math import log,gcd

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

N = int(input())
A = li()

res = 1
check = [0] * 30

def calc(_A,n):
    if n==-1:
        return 
    X = [a for a in _A if a>>n & 1]
    Y = [a for a in _A if a>>n & 1 == 0]
    if X and Y:
        check[n] = 1
    if n!=0:
        if X:
            calc(X,n-1)
        if Y:
            calc(Y,n-1)

calc(A,29)

for i in range(30):
    if check[i]:
        res *= 2


print(res)