#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll n,x;
    cin >> n >> x;

    vector<ll> va(n);
    map<ll, ll> m;
    for (auto&& v : va)
    {
        cin >> v;
        ++m[v];
    }

    ll res{ 0 };
    if (x == 0)
    {
        for (const auto& im : m)
        {
            if (im.second > 1)
                res += im.second * (im.second-1) / 2;
        }
    }
    else
    {
        sort(va.begin(), va.end());
        auto result = std::unique(va.begin(), va.end());
        va.erase(result, va.end());

        for (const auto& v : va)
        {
            ll xx = v ^ x;

            if (m.count(xx))
                res += m[xx] * m[v];
        }

        res /= 2;
    }
    cout << res << "\n";

    return 0;
}