#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, X, A;
  cin >> N >> X;
  map<int, int> MA;
  while (cin >> A) MA[A]++;
  long ans = 0;
  if (X) for (auto [a, b] : MA) ans += (long) b * MA[a ^ X];
  else for (auto [a, b] : MA) ans += (long) b * (b - 1);
  cout << ans / 2 << "\n";
}