N, X = gets.split(" ").map{|s| s.to_i}
a = []

N.times {
	a << gets.to_i
}

a.sort!

used = {}

cnt = 0
a.uniq.each {|y|
	next if used.include?(y)
	ymin = a.bsearch_index{|i| i >= y}
	ymax = a.bsearch_index{|i| i > y}
	ymax = N if not ymax
	ycnt = ymax - ymin
	z = y ^ X
	if z == y then
		cnt += ycnt * (ycnt - 1) / 2
		next
	end
	zmin = a.bsearch_index{|i| i >= z}
	next if not zmin
	used[z] = true
	zmax = a.bsearch_index{|i| i > z}
	zmax = N if not zmax
	zcnt = zmax - zmin
	cnt += ycnt * zcnt
}

puts cnt