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

int main() {
    int n, x;
    cin >> n >> x;
    map<int, int64_t> a, b;
    for (int i = 0; i < n; i++) {
        int k;
        cin >> k;
        a[k]++;
        b[k ^ x]++;
    }
    int64_t ans = 0;
    for (auto x : a) {
        ans += x.second * b[x.first];
    }
    if (x == 0) ans -= n;
    cout << ans / 2 << endl;
}