How to Hide Jetpack Admin Menus

function plt_hide_jetpack_menus() {
	//Hide the "Jetpack" menu.
	remove_menu_page('jetpack');
	//Hide the "Jetpack → Settings" menu.
	remove_submenu_page('jetpack', 'http://127.0.0.1/wp-admin/admin.php?page=jetpack#/settings');
	//Hide the "Jetpack → Dashboard" menu.
	remove_submenu_page('jetpack', 'http://127.0.0.1/wp-admin/admin.php?page=jetpack#/dashboard');
}

add_action('admin_menu', 'plt_hide_jetpack_menus', 2001);

Where do I put this code?