Add total members to “Right Now” dashboard widget

function dashboard_wps_user_count() {
    global $wpdb;
    $users = $wpdb->get_var("SELECT COUNT(ID) FROM $wpdb->users");
?>
<table>
    <tbody>
       <tr class="first">
          <td class="first b b_pages"><a href="users.php"><? echo $users; ?></a></td>
          <td class="t pages"><a href="users.php">Members</a></td>
       </tr>
     </tbody>
</table>
<?}
add_action( 'right_now_content_table_end', 'dashboard_wps_user_count');