dompdf Numbering pages but skip first one

I use dompdf class and I need page numembering for every page

I did this and it works:

$dompdf = new Dompdf();
$dompdf->load_html($html);
$dompdf->render();

$canvas = $dompdf->get_canvas();
$font = $dompdf->getFontMetrics()->get_font("helvetica", "bold");

$canvas->page_text(72, 18, "Header: {PAGE_NUM}", $font, 6, array(0,0,0));

What I need is just skip first page and start numbering from second page.

How can I do this?

from dompdf Numbering pages but skip first one