I have recently encountered a problem while coding a prototype for a game. I have 3 counters set up for 3 different variables, they are: the number of red cubes, the number of blue cubes, and the number of total cubes. I'm currently having trouble with the red and blue counters. I want to have it set up as to where a "blank" cube turns into a red or blue cube, it is counted once (and only once) and that one point per red / blue cube is put up on the score. What is currently happening is that whenever a red / blue cube enters the trigger collider, it is counted every time. I would like for it to only be counted once per cube, but I'm not sure how to do that. Thats where you come in! Code below (warning, its a bit messy)

 var isBlue = false;
 var isRed = false;
 static var BlueNum = 0;
 static var RedNum = 0;
 static var TotalNum = 0;
 
 
 function Start () {
 TotalNum++;
 }
 
 function Update () {
 
 if(TotalNum > 100){
 
 }
 if(isBlue == true){
 Blue();
 }
 if(isRed == true){
 Red();
 
     }
   }
 
 function OnTriggerEnter(thisTrigger : Collider) {
  if(thisTrigger.gameObject.tag == "Finish"){
  Debug.Log("t_blue");
  BlueNum++;
  renderer.material.color=Color.blue;
  isBlue = true;
  if(isRed == true){
  renderer.material.color=Color.red;
  Red();
  Debug.Log("red");
  
  }
  }
     
 if(thisTrigger.gameObject.tag == "Respawn"){
     Debug.Log("t_red");
     RedNum++;
        renderer.material.color=Color.red;
        isRed = true;
        Red();
        if(isBlue == true){
        renderer.material.color=Color.blue;
        Blue();
        Debug.Log("blue");
     }
     }
 }
 
 function Blue(){
 
 isRed = false;
 
    renderer.material.color=Color.blue;
 
   }
   
 function Red(){
 
 isBlue = false;
 
    renderer.material.color=Color.red;
 }