n=int(input())
a=sorted(list(map(int,input().split())),reverse=True)
rank=0
for j in range(60,-1,-1):
    idx=-1
    for i in range(rank,n):
        if a[i]&(1<<j):
            idx=i
            break
    if idx==-1:
        continue
    (a[rank],a[idx])=(a[idx],a[rank])
    for i in range(n):
        if a[i]&(1<<j) and not i==rank:
            a[i]^=a[rank]
    rank+=1
print(1<<rank)