#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(int)(n); i++)

using namespace std;
using LL = long long;
using P = pair<int,int>;

int main(){
	int N, X;
	cin >> N >> X;
	map<int,LL> m;
	vector<LL> A(N);
	rep(i,N){
		int a;
		cin >> a;
		A[i]=a;
		m[a]++;
	}
	LL ans=0;
	rep(i,N){
		LL k=X^A[i];
		ans+=m[k];
		if(k==A[i]) ans--;
	}
	cout << ans/2 << endl;

	return 0;
}