#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll arr[1000001];
int main()
{
    int n,X;
    cin>>n >> X;
    for(int i=0; i<n; i++)cin>>arr[i];
    map<long long, int>cnt;
    ll ans = 0;
    for(int i=0; i<n; i++)
    {
        if(cnt[arr[i] ^ X])
        {
            ans += cnt[arr[i] ^ X];
        }
        cnt[arr[i]]++;
    }
    cout << ans << endl;
}