#include<fstream>
#define N 2000100
#include<vector>
#define nm 1080
using namespace std;
ifstream f("oite.in");
ofstream g("oite.out");
int v[nm],n,sum,i,k,sol,S,j;
vector<pair<int,int> >H[N];
int main()
{
	f>>n>>sum;
	for(i=1;i<=n;++i)
		f>>v[i];
	for(i=1;i<=n;++i)
		for(j=i+1;j<=n;++j)
			if(v[i]+v[j]<=sum)
			H[v[i]+v[j]].push_back(make_pair(i,j));
	for(i=1;i<=n;++i)
		for(j=i+1;j<=n;++j)
		{
			S=sum-(v[i]+v[j]);
			for(k=0;k<H[S].size();++k)
				if(H[S][k].first!=i&&H[S][k].second!=j&&H[S][k].first!=j&&H[S][k].second!=i)
					sol++;
		}
	g<<sol/6;
	return 0;
}