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

N.times {
	a << gets.to_i
}

a.sort!

cnt = 0

while a do
	y = a[0]
	ycnt = a.bsearch_index{|i| i > y}
	ycnt = a.length if not ycnt
	z = y ^ X
	a = a[ycnt..-1]
	if z == y then
		cnt += ycnt * (ycnt - 1) / 2
		next
	end
	zmin = a.bsearch_index{|i| i >= z}
	next if not zmin
	zmax = a.bsearch_index{|i| i > z}
	zmax = a.length if not zmax
	zcnt = zmax - zmin
	cnt += ycnt * zcnt
	break if zmax == a.length
	a = a[0, zmin] + a[zmax..-1]
end

puts cnt