#include <fstream>
using namespace std;
ifstream fin ("triplete.in");
ofstream fout ("triplete.out");
int N, M, x, y, sol;
bool fr[4100][4100];

int main()
{
    fin >> N >> M;
    for (int i = 1; i <= M; i++)
    {
        fin >> x >> y;
        fr[x][y] = fr[y][x] = 1;
    }

    sol = N * (N - 1) * (N - 2) / 6;

    for (int i = 1; i <= N; i++)
    {
        for (int j = 1; j <= N; j++)
        {
            if (i != j)
            {
                if (!fr[i][j])
                {
                    sol /= 2;
                    fr[i][j] = fr[j][i] = 1;
                }
            }
        }
    }

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