#include<iostream>
#include<cstdio>
using namespace std;
long long chisla[1000000],kolko[1000000];
int main(){
 freopen ("xor.in", "r", stdin);
 freopen ("xor.out", "w" , stdout);

long long n,k,a=0,otg=0;
cin>>n>>k;
for(int i=0;i<n;i++){
    cin>>chisla[i];
    kolko[chisla[i]]++;
}
for(int i=0;i<n;i++){
    a=chisla[i]^k;
    if(a!=chisla[i]){
    otg+=kolko[a];
    }else{
    otg+=kolko[a]-1;
    }
}
if(n!=1){
cout<<otg/2<<"\n";
}else{
if(n==1){
    if(chisla[0]==k){
        cout<<1<<"\n";
    }else{
        cout<<0<<"\n";
    }
}
}
return 0;
}