#include <iostream>
#include <fstream>
#include <vector>
#include <tr1/unordered_map>

using namespace std;

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

const int MOD = 666013;

int V[1030];
tr1 :: unordered_map < int, vector < pair <int, int> > > M;
vector < pair < int, int > > :: iterator it;
vector < pair <int, int> > Hash[MOD];

int main ()
{
	int N, S, i, j, Ans = 0, now, x;

	in >> N >> S;

	for (i = 1; i <= N; i ++)
		in >> V[i];

    for (i = 1; i <= N; i ++)
        for (j = i + 1; j <= N; j ++)
            //M[ V[i] + V[j] ].push_back (make_pair (i, j));
            Hash[ (V[i] + V[j]) % MOD ].push_back (make_pair (i, j));

    for (i = 1; i <= N; i ++)
        for (j = i + 1; j <= N; j ++){
            now = S - V[i] - V[j];

            /*if (M[now].size ())
                for (it = M[now].begin (); it != M[now].end (); ++ it)
                    if ((it -> first) > j)
                        Ans ++;*/
            x = now % MOD;
            if (Hash[x].size ())
                for (it = Hash[x].begin (); it != Hash[x].end (); ++ it)
                    if ((it -> first) > j)
                        Ans ++;
                    //if (now + V[it -> first] + V[it -> second] == S && (it -> first) > j)
                      //  Ans ++;
        }

    out << Ans;

    return 0;
}