#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max()/32*15+208;



int main() {
    int n, x;
    cin >> n >> x;
    vector<int> v(n);
    map<int, ll> m;
    for (auto &&i : v) scanf("%d", &i), m[i]++;
    ll ans = 0;
    for (auto &&i : m) {
        if(x == 0) ans += i.second*(i.second-1);
        else if(m.count(i.first^x)) ans += i.second*m[i.first^x];
    }
    cout << ans/2 << "\n";
    return 0;
}