#include <cstdio>
#include <vector>
#define mod 666013
using namespace std;

vector<pair<int, int> > p[mod];

int v[1025];
int n, l, i, j, t;

inline int find_value(int x)
{
    int list=x%mod;

    vector<pair<int, int> >::iterator it;

    for(it=p[list].begin(); it!=p[list].end(); ++it)
    {
        if(it->first==x) return it->second;
    }

    return 0;
}

void insert_value(int x)
{
    int list=x%mod;

    vector<pair<int, int> >::iterator it;

    for(it=p[list].begin(); it!=p[list].end(); ++it)
    if(it->first==x)
    {
        ++it->second;
        return;
    }

    p[list].push_back(make_pair(x, 1));
}
int main()
{
    freopen("oite.in", "r", stdin);freopen("oite.out", "w", stdout);

    scanf("%d%d", &n, &l);

    for(i=1; i<=n; ++i)
        scanf("%d", &v[i]);

    for(i=1; i<=n; ++i)
    {
        for(j=i+1; j<=n; ++j)
        {
            if(v[i]+v[j]>l) continue;
            t+=find_value(l-v[i]-v[j]);
        }

        for(j=1; j<i; ++j)
        {
            if(v[i]+v[j]>l) continue;
            insert_value(v[i]+v[j]);
        }
    }

    printf("%d\n", t);
}