#include<fstream>
#define p 500009 
using namespace std;
struct nod{
       
       int inf,x,y;
       nod *urm;};
nod *hash[500009];       
void add(int val,int st ,int dr)
{int h=val%p;
nod *q=new nod;
q->inf=val;q->x=st;q->y=dr;q->urm=hash[h];
hash[h]=q;}
int main()
{int c,l,a[1025],s;
ifstream in("oite.in");
ofstream out("oite.out");
in>>c>>l;
for(int i=1;i<=c;i++)
 in>>a[i];
for(int i=1;i<c;i++)
 for(int j=i+1;j<=c;j++)
  {s=a[i]+a[j];
         add(s,i,j); 
}    
int contor=0;

for(int i=1;i<c;i++)
 for(int j=i+1;j<=c;j++)
  {s=l-a[i]-a[j];
  int h=s%p;
  for(nod *hh=hash[h];hh;hh=hh->urm)
   if(hh->inf==s && i!=hh->x && i!=hh->y && j!=hh->x && j!=hh->y) {/*out<<a[i]+a[j]<<" "<<hh->inf<<" "<<hh->x<<" "<<hh->y<<" "<<i<<" "<<j<<" "<<'\n';*/contor++;}
         }
         
    out<<contor/6; 
         
    return 0;}