#include <iostream>
#include <vector>
#include <map>

using namespace std;

using int64 = long long;

int main() {
    int n,x;
    cin >> n >> x;
    vector a(n,0);
    for (int i=0; i<n; i++) cin >> a[i];

    map<int,int64> mp;
    int64 ans = 0;
    for (auto ai : a) {
        ans += mp[ai];
        mp[ai ^ x]++;
    }

    cout << ans << endl;
}