How to Hide Proactive Security Suite Admin Menus

function plt_hide_proactive_security_suite_menus() {
	//Hide the "Settings → PSS Settings" menu.
	remove_submenu_page('options-general.php', 'pss-settings');
	//Hide the "Settings → Contact Us" menu.
	remove_submenu_page('options-general.php', 'pss-settings-contact');
	//Hide the "Settings → Upgrade" menu.
	remove_submenu_page('options-general.php', 'pss-settings-pricing');
}

add_action('admin_menu', 'plt_hide_proactive_security_suite_menus', 1000000000);

Where do I put this code?