3 logos

Hi I need to build an header like this, with 3 logos:
1) the main on the left
2) e 3) on the right (they need to be clickable).

Like this.

I followed this guide with no success (chapter “Add multiple logos”), put this code in my child functions.php:

-------------------------------
Remove the logo
-------------------------------

add_filter('avf_logo_final_output', 'avia_remove_default_logo', 10, 6);
function avia_remove_default_logo($logo, $use_image, $headline_type, $sub, $alt, $link){
return '';
}

-------------------------------
Additional Logos
-------------------------------
function add_logos($logo) {
  if(is_page(home)){

  $logo .= '<a class="first-logo" href="/"><img src="http://rivista-toscana-medica.local/wp-content/uploads/2022/03/logo-rivista.jpg"/></a>';
  $logo .= '<a class="second-logo" href="https://toscanamedica.org"><img src="http://rivista-toscana-medica.local/wp-content/uploads/2022/03/logo-ordine.jpg"/></a>';
  $logo .= '<a class="third-logo" href="https://www.pacinimedicina.it"><img src="http://rivista-toscana-medica.local/wp-content/uploads/2022/03/pacinimedicina.png"/></a>';
  }
  return $logo;
}
add_filter('avf_logo_final_output', 'add_logos');

But having this php error:

(! ) FATAL ERROR: UNCAUGHT ERROR: UNDEFINED CONSTANT “HOME” IN /USERS/NIGULI/LOCAL SITES/RIVISTA-TOSCANA-MEDICA/APP/PUBLIC/WP-CONTENT/THEMES/ENFOLD-CHILD/FUNCTIONS.PHP ON LINE 21

What am I doing wrong?
Line 21 is:
if(is_page(home)){

So does the code not recognize which is the homepage? why? Thanks for helping me.