#include using namespace std; typedef long long ll; typedef pair P; #define DUMP(x) cout << #x << " = " << (x) << endl; #define FOR(i, m, n) for (ll i = m; i < n; i++) #define IFOR(i, m, n) for (ll i = n - 1; i >= m; i--) #define REP(i, n) FOR(i, 0, n) #define IREP(i, n) IFOR(i, 0, n) #define FOREACH(x, a) for (auto&(x) : (a)) #define ALL(v) (v).begin(), (v).end() #define SZ(x) ll(x.size()) int main() { ll n, x; cin >> n >> x; vector a(n); map cnt; REP(i, n) { cin >> a[i]; cnt[a[i]]++; } ll ans = 0; REP(i, n) { ans += cnt[a[i] ^ x]; } ans /= 2; cout << ans << endl; }