#include <fstream>
#include <vector>
#define p1 666013
#define nmax 1030

using namespace std;

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

vector<int> f[p1];

int v[nmax];

int n, l, control, ct;

int main()
{
    in>>n>>l;
    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++)
        {
            control = l - (v[i] + v[j]);
            if(control < 0 )
                continue;
            for(int z = 0; z< f[control%p1].size(); z++)
            {
                if(f[control%p1][z] == control)
                {
                    ct++;
                }
            }
        }
        for(int j= i -1; j>=1; j--)
        {
            f[(v[i]+v[j])%p1].push_back((v[i]+v[j]));
        }
    }
    out<<ct;
    return 0;
}