Find max id from collection with Laravel

I am trying to find max id from model.

My model is MainsliderStatu.

$slider = new MainsliderStatu();

Here is My Code

$slider = $slider->find($slider->select('MAX(id) AS id'));

$slider->statu = Input::get('statu');

$slider->save();

But I am getting this error:

Controller method not found.

I thing it cant find select method.

How can we do it?

via Chebli Mohamed