n=int(input())
a=list(map(int,input().split()))
b=[0]*n;ans=0
for i in range(60,-1,-1):
    x=1<<i;q=-1
    for j in range(n):
        if b[j]:
            continue
        if a[j]&x:
            q=j;break
    if q<0:
        continue
    b[q]=1;ans+=1
    for j in range(n):
        if a[j]&x:
            a[j]^=x
print(1<<ans)