#include <iostream>
#define repn(i, x, y) for(int i=x; i<=y; i++)
#define rep(i, x, y) for(int i=x; i<y; i++)
using namespace std;
int n, x, k;
int a[100005], b[100005];

int main(){
    cin >> n >> x;
    int ans = 0;
    repn(i, 1, n) {
        cin >> a[i];
        ans += b[a[i]];
        //cout << (a[i] ^ x) << endl;
        b[a[i] ^ x]++;
    }
    cout << ans << endl;
    return 0;
}


//test for hack
//20 100000
//31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071 31071