n, x = read_line.split.map &.to_i
a = n.times.map { read_line.to_i }
cnt = Hash(Int32, Int64).new(0)
a.each do |i|
  cnt[i] += 1
end

ans = 0_i64
cnt.each do |val, c|
  val2 = val ^ x
  if val != val2
    ans = c * cnt.fetch(val2, 0)
  else
    ans = c*(c - 1)//2
  end
end
puts ans