Extract Enum's number in unityscript?

Unity Engine
1

So I wrote like,

var levelupFX  : GameObject[];

enum element4{
 Fire, Ice, Earth, Wind
}
function LeveupFX(who : int, sort : element4){  
   Instantiate(levelupFX[System.Enum.GetValues(typeof(sort))], transform.position, transform.rotation);   
 }
function OnGUI(){
if(Input.GetKeyDown("v")){ 
    LeveupFX(1, element4.Fire);
 }
}

So eventually what I want to do is, instantiating object between 4 objects as sort of element4 without using switch and string method.

But this occur error says,
InvalidCastException: Cannot cast from source type to destination type.

Then what is right method to doing extract numbers of enum? (in above case, for example, I want to get number of 1 by element4.Ice)

Thanks!

2

parseInt(element4.Ice)

3

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