#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1<<17;

int cnt[MAXN];

int main()
{
	freopen ("xor.in", "r", stdin);
	freopen ("xor.out", "w", stdout);
	
	int n, k, x;
	long long sol = 0;
	
	cin>>n>>k;
	
	while (n--)
	{
		cin>>x;
		sol += cnt[x ^ k];
		++cnt[x];
	}
	
	cout<<sol<<'\n';
}