#include <iostream>
#include <vector>
using namespace std;
int main(void) {
	int n, x;
	cin >> n >> x;
	vector<int> A(n), cnt(100100, 0);
	for (int i = 0; i < n; ++i) cin >> A[i];
	for (int i = 0; i < n; ++i) ++cnt[A[i]];
	long long ans = 0;
	for (int i = 0; i < n; ++i) {
		int diff = x - A[i];
		if (0 <= diff && diff <= 100000)
			ans += cnt[diff];
	}
	cout << ans << endl;
	return 0;
}