/* -*- coding: utf-8 -*-
 *
 * 1072.cc:  No.1072 A Nice XOR Pair - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

typedef long long ll;

/* global variables */

int as[MAX_N], cs[MAX_N];

/* subroutines */

/* main */

int main() {
  int n, x;
  scanf("%d%d", &n, &x);

  for (int i = 0; i < n; i++) scanf("%d", as + i);
  sort(as, as + n);

  int m = 0;
  for (int i = 0; i < n;) {
    int j = i + 1;
    while (j < n && as[i] == as[j]) j++;
    as[m] = as[i], cs[m] = j - i;
    m++;
    i = j;
  }
  //for (int i = 0; i < m; i++) printf("%d:%d ", as[i], cs[i]); putchar('\n');

  ll sum = 0;
  for (int i = 0; i < m; i++) {
    if (x == 0)
      sum += (ll)cs[i] * (cs[i] - 1) / 2;
    else {
      int b = as[i] ^ x;
      int j = lower_bound(as, as + m, b) - as;
      if (j < i && as[j] == b)
	sum += (ll)cs[i] * cs[j];
    }
  }

  printf("%lld\n", sum);
  return 0;
}