#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, x; cin >> n >> x;
	map<int, int64_t> mp;
	for(int i = 0; i < n; ++i) {
		int a; cin >> a;
		++mp[a];
	}
	int64_t ans = 0;
	for(auto& e : mp) {
		int nxt = e.first ^ x;
		if(nxt < e.first) continue;
		if(nxt == e.first) {
			ans += e.second * (e.second - 1) / 2;
		} else {
			ans += e.second * mp[nxt];
		}
	}
	cout << ans << '\n';
	return 0;
}