#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <map>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, x;
    cin >> n >> x;

    map<int, int> mp;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;

        mp[a]++;
    }

    ll r = 0;
    for (const auto& [a, k] : mp) {
        int b = a ^ x;
        if (a == b) {
            r += (ll)k * (k - 1);
        } else {
            r += (ll)k * mp[b];
        }
    }

    cout << r / 2 << endl;

    return 0;
}