#include<iostream>
#include<vector>

using namespace std;

int main() {

	int n, x;
	long long count = 0;//数え上げる変数
	cin >> n >> x;
	vector<int> data;
	int cnt[101010];
	for (int i = 0;i < n;i++) {
		int buff = 0;
		cin >> buff;
		data.push_back(buff);
	}
	for (int i = 0;i < n;i++) cnt[data[i]]++;//ヒストグラム生成


	for (int i = 0;i < n;i++) {
		int target = x - data[i];
		count += cnt[target];
	}
	cout << count << endl;

	return 0;
}