N=int(raw_input())
A=map(int,raw_input().split())
leftmost=60
ind=0
while leftmost>=0 and ind <N:
    A.sort()
    A.reverse()
    #for a in A:
    #    print format(a,'b')
    #print 
    while leftmost>=0 and (A[ind]&(1<<leftmost))==0:
        leftmost-=1
    if leftmost<0:
        break
    #print ind,":",leftmost,"...",(1<<leftmost),"&",A[ind]
    for i in range(N):
        if i==ind:
            continue
        if (A[i] &(1<<leftmost)) !=0:
            A[i]^=A[ind]
    ind+=1
    leftmost-=1
print 1<<ind