#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
typedef long long ll;
#define MOD 998244353
using namespace std;
int main() {
    ll n, x;
    cin >> n >> x;
    map<ll, ll> mp;
    vector<ll> a(n);
    for(int i = 0; i < n; i++) {
        cin >> a[i];
        mp[a[i]]++;
    }
    ll ans = 0, unq = 0;
    for(int i = 0; i < n; i++) {
        if(a[i] == (a[i] ^ x)) {
            unq++;
        }
        ans += mp[a[i] ^ x];
    }
    cout << ans / 2 - unq << endl;
}