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

int main(){
  map<ll,int> ma;
  int n;
  ll k;
  cin>>n>>k;
  ll vec[n];
  for(int i=0;i<n;i++){
    cin>>vec[i];
    ma[vec[i]]++;
  }
  ll ans=0;
  if(k==0){
    for(int i=0;i<n;i++){
      ans+=ma[vec[i]]-1;
    }
    cout<<ans/2<<endl;
    return 0;
  }
  for(int i=0;i<n;i++){
    ans+=ma[vec[i]^k];
  }
  cout<<ans/2<<endl;
}