12
 1378
 51202278
 989898989
 4
 7
 9
 6
 8
 12193721
 999999995
 999999999
 11
 999999996
 999999998
 3
 14
 15
 10
 999999994
 1000
 13781378
 5
 999999997
 1000000000
 13
 16
 0

6
 4
 4
 8
 6
 2
 8
 4
 6
 8
 2
 2
 2
 6
 4
 2
 4
 2
 4
 4
 6
 4
 8
 8
 6
 8
 6
 1

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x;
  while (cin >> n >> x) {
    int na[112345], da[112345] = {0};
    for (int i = 0; i < n; i++) {
      cin >> na[i];
      da[na[i]]++;
    }
    long long ans = 0;
    for (int i = 0; i < n; i++) {
      if ((na[i] ^ x) <= 1e5) ans += da[na[i] ^ x];
    }
    cout << ans / 2 << endl;
  }
}
