import sugar, strutils, sets


proc nextString: string =
  result = ""
  while not endOfFile stdin:
    let nextChar = readChar stdin
    case nextChar
    of '\r':
      discard
    of "\n"[0], ' ':
      break
    else:
      add result, nextChar


proc nextInt: int =
  parseInt nextString()


let
  n = nextInt()
  A = lc[nextInt() | (i <- 0 ..< n), int]

var
  B = [0].toSet

proc main: void =
  for j in 0 ..< 2:
    for i in 0 ..< n:
      for b in B:
        incl B, A[i] xor b
  echo B.len
  

when isMainModule:
  main()