#include <fstream>
#include <vector>

using namespace std;

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

struct elem
{
    int sum, i, j;
};
struct hash_
{
    vector<elem> vec;
};

int n, s;
int v[1030];
hash_ h[945350];
int MOD = 945327;
long long ans = 0;

void ins(int val, int i, int j)
{
    int x = val % MOD;
    elem aux;

    aux.sum = val;
    aux.i = i;
    aux.j = j;

    h[x].vec.push_back(aux);
}

void sr(int val, int i, int j)
{
    int x = val % MOD;

    for(auto el: h[x].vec)
    {
        if(val == el.sum && i != el.i && i != el.j && j != el.i && j != el.j && j < el.i)
        {
            ans++;
            //out<<i<<" "<<j<<" "<<el.i<<" "<<el.j<<'\n';
        }
    }
}

int main()
{
    in>>n>>s;

    for(int i = 1; i<=n; i++)
    {
        in>>v[i];
    }

    for(int i = 1; i<n; i++)
    {
        for(int j = i+1; j<=n; j++)
        {
            ins(v[i] + v[j], i, j);
        }
    }

    for(int i = 1; i<=n-3; i++)
    {
        for(int j = i+1; j<=n-2; j++)
        {
            if(s-v[i]-v[j] >= 0)
            {
                sr(s-v[i]-v[j], i, j);
            }
        }
    }

    out<<ans;

    return 0;
}