if __name__ == "__main__":
  ss = raw_input()
  l = raw_input().split(" ")
  ans = [0]
  res = 0
  tmp = 0
  for i in l:
    tmp ^= int(i)
    if tmp in ans:
      ans = []
      tmp = 0
      res +=1
      ans.append(0)
    else:
      ans.append(tmp)

  print res