Retreiving variable with message

I am trying to retreive variable to display along with message this way. but, i came to know this actually is not a way. $count is the variable to be displayed along with message.

   public function now(Request $request)
      {
            $name=$request->get('name');
            $contact=$request->get('contact');
            $level=$request->get('level');

            $count=$level*3.5;
            return redirect('/lost')
                    ->with ('message','You have increased your level to $count.');
        }

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