#include <bits/stdc++.h>

using namespace std;

int n,s,t[1025],nr;

int main() 
{
    ifstream cin("oite.in");
    ofstream cout("oite.out");
    cin>>n>>s;    
    for (int i=1; i<=n; i++)
        cin>>t[i];
    sort(t+1,t+n+1);
    for (int i=1; i<=n-3; i++)
        for (int j=i+1; j<=n-2; j++)
            for (int k=j+1; k<=n-1; k++)
                for (int z=k+1; z<=n; z++)
                {
                    if (t[i]+t[j]+t[k]+t[z]==s) nr++; else break;
                }
    cout<<nr;
}