#include <bits/stdc++.h>
#define int long long
#define endl '\n'
#define FOR(i, a, n) for (int i = (a); i < (n); ++i)
#define REP(i, n) FOR(i, 0, n)
using namespace std;

void _main() {
    int N, X;
    cin >> N >> X;
    vector<int> A(N);
    map<int, int> mp;
    for (int i = 0; i < N; ++i) {
        cin >> A[i];
        mp[A[i]]++;
    }
    int ans = 0;
    for (int i = 0; i < N; ++i) {
        if (X) ans += mp[A[i] ^ X];
        else ans += mp[A[i]] - 1;
    }
    ans >>= 1;
    cout << ans << endl;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(10);
    _main();
    return 0;
}