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

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