#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()

int main(){
    int N;
    ll X;
    cin >> N >> X;
    vector<ll> A(N);
    rep(i, 0, N) cin >> A[i];

    ll ans = 0LL;
    map<ll, ll> mp;
    rep(r, 0, N){
        if(r > 0) mp[A[r-1]]++;
        ans += mp[X ^ A[r]];
    }
    cout << ans << endl;
    
    return 0;
}