#include <fstream>
#include <vector>
#define MOD 666013
using namespace std;
ifstream fin ("oite.in");
ofstream fout ("oite.out");
typedef struct { int p1, p2, val; } art;
int N, L, sol, V[1100];
vector < art > H[MOD + 16];

int main()
{
    fin >> N >> L;
    for (int i = 1; i <= N; i++) {
        fin >> V[i];
    }

    for (int i = 1; i < N; i++)
    {
        for (int j = i + 1; j <= N; j++)
        {
            int sum = V[i] + V[j];
            int poz = sum % MOD;
            H[poz].push_back( { i, j, sum } );
        }
    }

    for (int i = 1; i < N; i++)
    {
        for (int j = i + 1; j <= N; j++)
        {
            int sum = L - (V[i] + V[j]);
            if (sum < 0) continue;
            int poz = sum % MOD;
            for (int k = 0; k < H[poz].size(); k++)
            {
                if (sum == H[poz][k].val &&
                    H[poz][k].p1 != i &&
                    H[poz][k].p1 != j &&
                    H[poz][k].p2 != i &&
                    H[poz][k].p2 != j) {
                    sol++;
                }
            }
        }
    }

    fout << sol / 6 << '\n';
    fout.close();
    return 0;
}