#include<fstream>
#define N 2000100
#include<vector>
#define mod 666013
#define nm 1080
using namespace std;
ifstream f("oite.in");
ofstream g("oite.out");
int v[nm],n,sum,i,k,sol,mo,S,j;
vector<pair<int,int> >H[mod];
vector<int> V[mod];
int main()
{
    f>>n>>sum;
    for(i=1;i<=n;++i)
        f>>v[i];
    for(i=1;i<=n;++i)
        for(j=i+1;j<=n;++j)
            if(v[i]+v[j]<=sum)
            {
                S=v[i]+v[j];
                mo=S%mod;
                V[mo].push_back(S);
                H[mo].push_back(make_pair(i,j));
            }
    for(i=1;i<=n;++i)
        for(j=i+1;j<=n;++j)
        {
            S=sum-(v[i]+v[j]);
			if(S<0)
				continue;
            mo=S%mod;
            for(k=0;k<H[mo].size();++k)
                if(V[mo][k]==S&&H[mo][k].first!=i&&H[mo][k].second!=j&&H[mo][k].first!=j&&H[mo][k].second!=i)
                    sol++;
        }
    g<<sol/6;
    return 0;
}