#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template <class T, class U> using Pa = pair<T, U>;
template <class T> using vec = vector<T>;
template <class T> using vvec = vector<vec<T>>;


int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N,X;
    cin >> N >> X;
    ll ans = 0;
    map<int,ll> mp;
    for(int i=0;i<N;i++){
        int a;
        cin >> a;
        ans += mp[X^a];
        mp[a]++;
    }
    cout << ans << "\n";
}