#include <bits/stdc++.h>
#define filein(str) freopen(str, "r", stdin)
#define fileout(str) freopen(str, "w", stdout);
using namespace std;

int nums[1000005];
map<int, int> s;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(NULL);

	filein("xor.in");
    fileout("xor.out");

    int n, k;
    long long ans = 0;
    cin >> n >> k;

    for(int i = 0; i < n; i++) {
        cin >> nums[i];
        ans += s[nums[i] ^ k];
        s[nums[i]]++;
    }
    cout << ans << endl;

	return 0;
}