local ffi = require("ffi")
local C = ffi.C
ffi.cdef[[
long long atoll(const char*);
]]

local function lltonumber(str)
  return C.atoll(str)
end

local n = io.read("*n", "*l")
local str = io.read()
local a = {}
for w in str:gmatch("%d+") do
  table.insert(a, lltonumber(w))
end
local digmax = 61
local ret = 1LL
local t = {}
for i = 1, digmax do
  t[i] = {}
  for j = 1, n do
    t[i][j] = a[j] % 2LL == 1LL
    a[j] = a[j] / 2LL
  end
end
local rem = n
for j = 1, digmax do
  local tgt = 0
  local tj = t[j]
  for i = 1, rem do
    if tj[i] then
      ret = ret + ret
      tgt = i
      break
    end
  end
  if 0 < tgt then
    for i = tgt + 1, rem do
      if t[j][i] then
        for k = j + 1, digmax do
          if t[k][tgt] then t[k][i] = not t[k][i] end
        end
      end
    end
    if tgt < rem then
      for k = j + 1, digmax do
        t[k][tgt] = t[k][rem]
      end
    end
    rem = rem - 1
  end
end
ret = tostring(ret):gsub("LL", "")
print(ret)
-- print(os.clock())