#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int n = ri();
	int x = ri();
	int a[n];
	for (auto &i : a) i = ri();
	std::map<int, int> all;
	for (auto i : a) all[i]++;
	int64_t res = 0;
	for (int i = 0; i < n; i++) res += all[a[i] ^ x];
	if (!x) for (auto &i : all) res -= (int64_t) i.second * i.second;
	printf("%" PRId64 "\n", res / 2);
	return 0;
}