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

int main()
{
	int N;
	long long X;
	cin >> N >> X;
	vector<long long> A( N );
	for( int i = 0; i < N; i++ ) {
		cin >> A[i];
	}

	map<long long, long long> mp;
	for( int i = 0; i < N; i++ ) {
		mp[ A[i] ]++;
	}
	long long ans = 0;
	for( auto it = mp.begin(); it != mp.end(); it++ ) {
		long long x = it->first ^ X;
		if( x == it->first ) ans += it->second * (it->second - 1);
		else ans += it->second * mp[x];
	}
	ans /= 2;

	cout << ans << endl;
}