Setting the value of a var to the value of another

Hi everyone. I am having a problem of setting the value of one variable to the value of another.

This is my script:

     var MaxArmourValue = 3;
     var MinArmourValue = 1;
     var CurrentArmourValue = 1;
     
     var HelmSelection = CurrentArmourValue;
 
     function OnGUI(){
 
             GUI.Box (Rect (420,10,250,90), "Helmet "+ HelmSelection);
             
             if (GUI.Button (Rect (600, 20, 50, 20), ">")) {
                 HelmSelection +=CurrentArmourValue;
             }
 
             if (HelmSelection > MaxArmourValue){
                 HelmSelection = MinArmourValue;
             }
             
             else if (HelmSelection < MinArmourValue); {
                 HelmSelection = MaxArmourValue;
             }
                 
             if (GUI.Button (Rect (440, 20, 50, 20), "<")) {
                 HelmSelection -=CurrentArmourValue;
             }
             if (GUI.Button (Rect (495, 50, 100, 20), "Accept")) {
                 
             }
 }

What I want to do is when the > or < buttons are pressed, the rectangle will show "Helmet 1/2/3" etc. This works but I don't know how to stop the values from going over 3 and below 1. All help is appreciated.