#include<fstream>
#include<cmath>
#include<vector>
#define MOD 9917
using namespace std;
int n,L,v[1030];
struct Suma{int sum,ind1;};
vector <int> H[9917];

inline void Citire()
{
	int i;
	ifstream fin("oite.in");
	fin>>n>>L;
	for(i=1;i<=n;i++)
		fin>>v[i];
	fin.close();
}

inline void Rezolvare()
{
	register int i,j,suma,poz,sol=0;
	vector <int>::iterator it;
	for(i=1;i<=n;i++)
	{
		for(j=i+1;j<=n;j++)
		{
			suma=L-v[i]-v[j];
			if(suma>=0)
			{
				poz=suma%MOD;
				for(it=H[poz].begin();it!=H[poz].end();it++)
				{
					if(*it==suma)
						sol++;
				}
			}
		}
		for(j=1;j<i;j++)
		{
			suma=v[i]+v[j];
			H[suma%MOD].push_back(suma);
		}
	}
	ofstream fout("oite.out");
	fout<<sol<<"\n";
	fout.close();
}

int main()
{
	Citire();
	Rezolvare();
	return 0;
}