package main

import (
	"fmt"
	"bufio"
	"os"
)

func main() {
	r := bufio.NewReader(os.Stdin)
	w := bufio.NewWriter(os.Stdout)
	defer w.Flush()
	var N, X int
	fmt.Fscan(r, &N, &X)
	a := make(map[int]int, N)
	for i := 0; i < N; i++ {
		var k int
		fmt.Fscan(r, &k)
		if v, ok := a[k]; ok {
			a[k] = v + 1
		} else {
			a[k] = 1
		}
	}
	cnt := 0
	for k, v := range a {
		delete(a, k)
		x := k ^ X
		if x == k {
			cnt += v * (v - 1) / 2
			continue
		}
		if vx, ok := a[x]; ok {
			delete(a, x)
			cnt += v * vx
		}
	}
	fmt.Fprintln(w, cnt)
}