#include <fstream>
#include <vector>
#define mod 1000017
using namespace std;
ifstream fin ("oite.in");
ofstream fout ("oite.out");
int n,s,i,j,m,ok,su,k,rez,v[1026];
vector < pair <int,int> > x[mod];
int main()
{
    fin>>n>>s;
    for (i=1; i<=n; i++)
        fin>>v[i];
    for (i=1; i<=n; i++)
    {
        for (j=i+1; j<=n; j++)
        {
            su=s-v[i]-v[j];
            if (su<0)
                continue;
            m=su%mod;
            for (k=0; k<x[m].size (); k++)
            {
                if (x[m][k].first==su)
                {
                    rez+=x[m][k].second;
                    break;
                }
            }
        }
        for (j=1; j<i; j++)
        {
            su=v[i]+v[j];
            if (su>s)
                continue;
            m=su%mod;
            ok=1;
            for (k=0; k<x[m].size (); k++)
            {
                if (x[m][k].first==su)
                {
                    x[m][k].second++;
                    ok=0;
                    break;
                }
            }
            if (ok==1)
                x[m].push_back (make_pair(su,1));
        }
    }
    fout<<rez<<"\n";
    return 0;
}