#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;

typedef long long ll;

int main() {
    int N, X;
    cin >> N >> X;
    vector<int> A(N);
    map<int, int> m;
    rep(i, N) {
        cin >> A[i];
        m[A[i]]++;
    }
    ll ans = 0;
    rep(i, N) {
        ans += m[A[i] ^ X];
        if ((A[i] ^ A[i]) == X) {
            //cout << A[i] << "\n";
            ans--;
        }
    }
    cout << ans / 2 << "\n";
}