int main()
{
    int h = 0;
    cout << "podaj h" << endl;
    cin >> h;
    for (int i = 0; i < h * 3; i += 3) {
        for (int j = 0; j <= i / 3; j++) {
            cout << i + (3 * j) << " ";
        }
        cout << endl;
    }
}