#include<iostream>

using namespace std;

int main() {

	int n, x;
	int cnt[101010];
	int* array;

	cin >> n >> x;
	array = new int[n];
	for (int i = 0;i < n;i++) {
		cin >> array[i];
	}
	for (int i = 0;i < n;i++) {
		cnt[array[i]]++;
	}

	int ans = 0;
	for (int i = 0;i < n;i++) {
		int d = x - array[i];
		if (d >= 0 && d <= 100000)ans += cnt[d];
	}
	cout << ans << endl;

	delete array;

	return 0;
}