N, X = gets.split(" ").map{|s| s.to_i}
a = Hash.new(0)

N.times {
	a[gets.to_i] += 1
}

cnt = 0
a.keys.each {|k|
	next if not a.has_key?(k)
	vk = a.delete(k)
	x = k ^ X
	if x == k then
		cnt += vk * (vk - 1) / 2
		next
	end
	next if not a.has_key?(x)
	vx = a.delete(x)
	cnt += vk * vx
}

puts cnt