#include <bits/stdc++.h>
#define endl '\n'

using namespace std;
template<class T, class T1> inline void chkmax(T &x, const T1 &y) { if (x < y) x = y; }
template<class T, class T1> inline void chkmin(T &x, const T1 &y) { if (x > y) x = y; }

const string TASK_NAME = "xor";
const bool DEBUG = false;

int n, k;
long long a[100000];
map<long long, long long> m;

void read()
{
    cin >> n >> k;
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        if (m.count(a[i]) == 0)
            m[a[i]] = 1;
        else
            m[a[i]]++;
    }
}

void solve()
{
    long long ans = 0ll;
    for (int i = 0; i < n; i++)
    {
        m[a[i]]--;
        int next = a[i] ^ k;
        if (m.count(next) > 0)
            ans += m[next];
    }
    cout << ans << endl;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if (!DEBUG)
    {
        freopen((TASK_NAME + ".in").c_str(), "rt", stdin);
        freopen((TASK_NAME + ".out").c_str(), "wt", stdout);
    }
    m.clear();

    read();
    solve();

    return EXIT_SUCCESS;
}