#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
#define DUMP(x) cout << #x << " = " << (x) << endl;
#define FOR(i, m, n) for (ll i = m; i < n; i++)
#define IFOR(i, m, n) for (ll i = n - 1; i >= m; i--)
#define REP(i, n) FOR(i, 0, n)
#define IREP(i, n) IFOR(i, 0, n)
#define FOREACH(x, a) for (auto&(x) : (a))
#define ALL(v) (v).begin(), (v).end()
#define SZ(x) ll(x.size())

int main() {
  ll n, x;
  cin >> n >> x;
  vector<ll> a(n);
  map<ll, ll> cnt;
  REP(i, n) {
    cin >> a[i];
    cnt[a[i]]++;
  }

  ll ans = 0;
  if (x == 0) {
    for (auto& p : cnt) {
      ll d = p.second;
      ans += d * (d - 1) / 2;
    }
    cout << ans << endl;
    return 0;
  }
  REP(i, n) { ans += cnt[a[i] ^ x]; }
  ans /= 2;
  cout << ans << endl;
}