Life calculator

Hello, I have 2 script and a is I control a life bar. And the other is to calculate the fall.But I would not prescisase click to lower the bar,I would like to do this fall calculator do this for me.

Note: I'm Brazilian and my Unity is free And I'm kinda stupid in these parts so please let the script ready

 #pragma strict
 var Person : CharacterController;
 var Velocidade : float;
 var Pisando : boolean;
 var Life : int;
 var Dano : int = 2;
 
 function Start () {
 
 }
 
 function Update () {
  Person = GameObject.FindObjectOfType(CharacterController);
  Velocidade = Person.velocity.magnitude;
 }
 function OnControllerColliderHit(Co : ControllerColliderHit){
  if(Person.isGrounded){
  Pisando = true;
  }else{
  Pisando = false;
  }
  if(Velocidade >= 14){
   if(Pisando){
    Life -=Velocidade * Dano;
   }
  }
 }

-------------2º

 #pragma strict
 
 var texButton : GUISkin;
 
     var posY: float;
     var Alt:  float;
     var Lar:  float;
     
     var QntVida:float;
     var MaxQntVida: float;
     
     var tempo: float;
     
     function Start () {
     QntVida=100;
     MaxQntVida=100;
     }
     
     function Update () {
     
     Lar  = Screen.width/4 * (QntVida/MaxQntVida); 
     posX = Screen.width/2 - Lar/2;
     posY = Screen.height/2 - Screen.height/4;
     Alt  = Screen.height/10;
     
     
     if (Input.GetKey("c"))
     {
       if (QntVida>0)
       {
        QntVida = QntVida-0.5;
        tempo = -60;
       }
     }
     
     if (tempo>=0)
     {
      if (QntVida<100)
      {
        if (tempo>0.01)
        {
        QntVida = QntVida+0.5;
        tempo = 0;
        }
      }
     
     
     
     }
     
     
     tempo=tempo+Time.deltaTime;
     }
     
     function OnGUI()
     {
     GUI.skin = texButton;
     
     GUI.Button(Rect(posX,posY,Lar,Alt)," ");
     
     
     
     }