#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 5;

int a[N];
int cnt[N];

int main()
{
#if AT_LVLS9_PC
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios::sync_with_stdio(false);

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

    long long ans = 0;
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
        cnt[a[i]]++;
        ans += cnt[a[i] ^ x];
    }

    cout << ans << endl;
    return 0;
}