/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.06.05 21:52:07
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n,x;cin >> n >> x;
    map<int,int> mp;
    ll ans = 0;
    for (int i = 0; i < n; i++) {
        int a;cin >> a;
        if (mp.find(x ^ a) != mp.end()) {
            ans += mp[x ^ a];
        }
        mp[a]++;
    }
    cout << ans << endl;
    return 0;
}