For showing total number of items in search and tag pages go to :

components\com_k2\views\itemlist\view.html.php

 

line : 381

add this :

$this->assignRef('total', $total);

 

in this statement:

 

else {            $this->assignRef('items', $items);         }

 

some thing like this:

 

else {            $this->assignRef('items', $items);          $this->assignRef('total', $total);        }

 

 

and you can show total number of items by this code:

 

$this->total

 

in generic.php