Audio plays when i click F

Hello guys, i'm beginner in making script's. So i wrote a script when i click F, the audio play. But that's not happening? What could be wrong?

There is the script:

 function Update () {
 
 if (Input.GetKeyDown("f")) 
   (audio.play("kartka.wav"));
   ;
 
 
 }

If you guys know the solution how to solve this problem, just write it. It help me so much.