#include<bits/stdc++.h>

using namespace std;
using ll = long long int;
using lc = complex<double>;

int main(void) {
    constexpr ll MOD = 1e9 + 7;
    constexpr double PI = acos(-1);
    cout << fixed << setprecision(32);
    cin.tie(0); ios::sync_with_stdio(false);

    ll n, x;
    cin >> n >> x;
    map<ll,ll> m;
    while(n--) {
        ll a;
        cin >> a;
        m[a]++;
    }

    ll r = 0;
    for(auto &[y, c]: m) {
        ll z =  x ^ y;
        if(z > y) continue;
        r += (z == y ? (c-1)*m[z]/2 : c * m[z]);
    }
    cout << r<< endl;
}