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

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int n,x; cin>>n>>x;
	unordered_map<int,int>m;
	for(int i=0;i<n;++i){
		int a; cin>>a;
		++m[a];
	}
	int64_t ans=0;
	for(auto&&i:m){
		int a=i.first,b=i.second,xorr=a^x;
		int64_t tmp=1L*m[xorr]*b;
		if(a==xorr)ans+=tmp/2;
		else ans+=tmp;
	}
	cout<<ans/2<<"\n"s;
}