#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (int)n; ++i)
#define FOR(i, a, b) for(int i = a; i < (int)b; ++i)
#define rrep(i, n) for(int i = ((int)n - 1); i >= 0; --i)

using ll = long long;
using ld = long double;

const ll INF = 1e18;
const int Inf = 1e9;
const double EPS = 1e-9;
const int MOD = 1e9 + 7;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(0);
    int n;
    ll x;
    cin >> n >> x;
    map<ll, int> mp;
    rep (i, n) {
        ll a;
        cin >> a;
        mp[a]++;
    }
    ll res = 0;
    for (auto m: mp) {
        m.second;
        ll t = m.first ^ x;
        res += m.second * mp[t];
    }
    cout << res / 2 << endl;
    
    return 0;
}