#include <fstream>
#include <vector>
using namespace std;

ifstream fin("oite.in");
ofstream fout("oite.out");

const int MOD = 1e5 + 7;

int n, cnt, l;

vector < pair <int, int> > h[MOD + 5];

void update(int val)
{
	if (val > l) return;
	int s = val % MOD;
	for (size_t i = 0; i < h[s].size(); ++i)
	{
		if (h[s][i].first == val)
		{
			h[s][i].second++;
			return;
		}
	}
	h[s].push_back({ val, 1 });
}
int query(int val)
{
	int s = val % MOD;
	if (val < 0) return 0;
	for (size_t i = 0; i < h[s].size(); ++i)
		if (h[s][i].first == val) return h[s][i].second;
	return 0;
}

int main()
{
	fin >> n >> l;
	vector <int> v(n);
	for (int i = 0; i < n; ++i)
		fin >> v[i];
	for (int i = 0; i < n; ++i)
	{
		for (int j = i + 1; j < n; ++j)
			cnt += query(l - v[i] - v[j]);
		for (int j = 0; j < i; ++j)
			update(v[i] + v[j]);
	}

	fout << cnt << "\n";
	return 0;
}