#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#include <atcoder/dsu>
#include <atcoder/segtree>
using namespace atcoder;
using namespace std;
typedef long long ll;
#define rep(i,a,b) for(int i=a;i<b;i++)
using vi = vector<int>; 
using vvi = vector<vi>; 
using li =vector<ll>;
using lli=vector<li>;
using si =vector<char>;
using ssi =vector<si>;
const long long INF = 1e18;
const long long MOD=1e9+7;
//for (auto [key, val] : mp)
int main() { ll n,x;cin>>n>>x;
//li vec(n);
map<ll,ll>mp;
rep(i,0,n){ll a;cin>>a;mp[a]++;}
if(x==0){ll ans=0;
	for(auto [key,val]:mp){
	ans+=val*(val-1)/2;	
	}
	cout<<ans;
}
else {ll ans=0;
	for(auto [key,val]:mp){
		ll y=x^key;
		ans+=mp[y]*(mp[y]-1)/2;
	}
	cout<<ans/2;
}
}