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

int main()
{
	int64_t n, x;
	cin >> n >> x;
	vector<int64_t> as(n);
	for (auto &&a : as)
	{
		cin >> a;
	}

	sort(as.begin(), as.end());

	int64_t ans = 0;
	for (int64_t i = 0; i < n; i++)
	{
		ans += distance(lower_bound(as.begin() + i + 1, as.end(), as[i] ^ x), upper_bound(as.begin() + i + 1, as.end(), as[i] ^ x));
	}

	cout << ans << endl;

	return 0;
}