import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
A=[int(i) for i in input().split()]
m=2**14
DP=[[0]*m for _ in range(n+1)]
DP[0][0]=1
for i in range(n):
  for j in range(m):    
    DP[i+1][j]=max(DP[i][j],DP[i][j^A[i]])
print(sum(DP[n]))