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

int main(){
    int n,x;
    cin>>n>>x;
    vector<int>a(n);
    rep(i,n)cin>>a[i];
    map<int,int>mp;
    ll ans=0;
    rep(i,n){
        ans+=mp[x^a[i]];
        mp[a[i]]++;
    }
    cout<<ans<<endl;
}