#include <fstream>
#define Tmax 1025
using namespace std;
ifstream in("oite.in");
ofstream out("oite.out");
long N, L, a[Tmax], R = 0;
int main(){
    in>>N>>L;
    for(int i = 1; i <= N; i++){
        in>>a[i];
    }
    for(int i = 1; i <= N; i++){
        for(int j = i+1; j <= N; j++){
            for(int k = j+1; k <= N; k++){
                for(int h = k+1; h <= N; h++){
                    if (a[i]+a[j]+a[k]+a[h] == L) R++;
                }
            }
        }
    }
    out<<R;

    return 0;
}