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

N.times {
	a << gets.to_i
}

a.sort!

cnt = 0
a.uniq.each {|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
	zmin = a.bsearch_index{|i| i >= z}
	next if not zmin
	zmax = a.bsearch_index{|i| i > z}
	zmax = N if not zmax
	zcnt = zmax - zmin
	cnt += ycnt * zcnt
}

puts cnt / 2