#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
int n,i,j,k,v[1100],l,pos,ok,coun,po;
struct oite
{
    int val,i,j;
};
const int maxp=666013;
vector<oite> h[maxp];
oite t;
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]);
    sort(v+1,v+n+1);
    for(i=1;i<n;i++)
        for(j=i+1;j<=n;j++)
        {
            t.val=(v[i]+v[j]);
            t.i=i;
            t.j=j;
            h[(v[i]+v[j])%maxp].push_back(t);
        }
   for(i=0;i<((l/2)%maxp);i++)
       if(h[i].size()>0)
           for(j=0;j<h[i].size();j++)
           {
               ok=l%maxp-h[i][j].val%maxp;
               if(h[ok].size()>0&&ok>=0)
              //for(k=0;k<h[ok].size();k++)
                //  if(h[i][j].i!=h[ok][k].i&&h[i][j].j!=h[ok][k].j&&h[i][j].i!=h[ok][k].j&&h[i][j].j!=h[ok][k].i&&h[ok][k].val+h[i][j].val==l&&h[i][j].j<h[ok][k].i)
                   coun++;
           }
   printf("%d",coun);
    return 0;
}