#include<bits/stdc++.h>

using namespace std;
using ll = long long;


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

	for(int i = 0; i < n; i++) {
		int g = x ^ a[i];
		sum += mp[g];
		mp[a[i]]++;
	}
	cout << sum << endl;


}