N, X = gets.split.map(&:to_i)
A = N.times.map { gets.to_i }
checked = Hash.new(false)

C = A.tally
C.default = 0
ans = 0

A.uniq.each do |a|
  next if checked[a]
  checked[a] = true

  y = X ^ a
  checked[y] = true
  cnt = C[y]

  next if cnt == 0

  if a == y
    ans += cnt * (cnt - 1) / 2
  else
    ans += cnt * C[a]
  end
end

puts ans