#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n, x;
  cin >> n >> x;
  map<int, int> mp;
  ll ans = 0;
  rep(_, n) {
    int a;
    cin >> a;
    ans += mp[a ^ x];
    mp[a]++;
  }
  cout << ans << '\n';
  return 0;
}