# include <fstream>
# include <vector>
# define DIM 1034
# define MOD 5000010
# define f first
# define s second
using namespace std;
ifstream fin("oite.in");
ofstream fout("oite.out");
vector <pair<int,int> > Rest[MOD+5];
int v[DIM],n,val,i,j,r,a,b,poz,q;
long long sol;
int main () {
    fin>>n>>val;
    q=val;
    for(i=1;i<=n;i++)
        fin>>v[i];
    Rest[(v[1]+v[2])%MOD].push_back(make_pair(v[1]+v[2],1));
    for(i=3;i<=n-1;i++){
        for(j=i+1;j<=n;j++){

            b=val - v[i] - v[j];
            if(b<0) {
                b+=MOD;
                continue;
            }
            b %= MOD;
            for(r=0;r<Rest[b].size();r++){
                if(v[i]+v[j]+Rest[b][r].f==val)  {
                    sol+=Rest[b][r].s;
                    break;
                }
            }
        }
        for(j=i-1;j>=1;j--){
            a=(v[i]+v[j])%MOD;
            poz=-1;
            for(r=0;r<Rest[a].size();r++){
                if(Rest[a][r].f==v[i]+v[j]){
                    Rest[a][r].s++;
                    poz=r;
                    break;
                }
            }
            if(poz==-1)
                Rest[a].push_back(make_pair(v[i]+v[j],1));
        }
    }
    fout<<sol<<"\n";
    return 0;
}