#include <fstream>
#include <vector>
#define mod 666013

using namespace std;

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

int n,i,j,k,l,sum,x,v[1050],sol;

vector <int> h[666015];

int main () {

    fin>>n>>l;

    for (i=1;i<=n;i++)
        fin>>v[i];

    for (i=1;i<=n;i++) {
        for (j=i+1;j<=n;j++) {
            sum=l-v[i]-v[j];
            x=sum%mod;
            for (k=0;k<h[x].size();k++) {
                if (h[x][k]==sum)
                    sol++;
            }
        }
        for (k=1;k<i;k++){
            sum=v[i]+v[k];
            x=sum%mod;
            h[x].push_back(sum);
        }
    }

    fout<<sol<<"\n";

    return 0;
}