#include<bits/stdc++.h>
using namespace std;
int main(){
    long n,x;
    cin >> n >> x;
    long ar[n];
    for(int i=0;i<n;i++)cin >> ar[i];
    map<long,long>a;
    map<long,long>b;
    set<long>s;
    for(int i=0;i<n;i++){
        a[ar[i]]++;
        b[ar[i]^x]++;
        s.insert(ar[i]);
    }
    long ans = 0;
    for(long i: s){
        if(x != 0)ans += a[i] * b[i];
        else ans += a[i] * (b[i]-1);
    }
    cout << ans/2 << endl;
}