convert js script into C#

I have this script that is made in javascript and I need to change it into C# so I can reference it in my player car controller script

here's the script:

 var leftflames : GameObject;
 var rightflames : GameObject;
  var activateSound : AudioClip;
  var vehicle : GameObject;
  var remainingNitrous : float = 30; //make 50 the maximum amount of nitrous the player can have
 static var MaxNitroCapacity : float = 30;
 var CanRefill : boolean = false;
 
  function Start () {
  
  }
  
  function Update () {
 
 
 if (Input.GetButton("Fire1")){
 if(remainingNitrous > 0){
  leftflames.gameObject.active = true;
  rightflames.gameObject.active =true;
 }
 }
 
 if (Input.GetButtonUp("Fire1")){
  leftflames.gameObject.active = false;
  rightflames.gameObject.active =false;
 }
 
 if (Input.GetButtonUp("Fire1")){
 if (remainingNitrous > 0){
 CanRefill = true;
 }
 }
 
 if (remainingNitrous == MaxNitroCapacity){
 CanRefill = false;
 
 }
 
 
 
 if (CanRefill){
 remainingNitrous +=1;
 }
 
  if (Input.GetButtonDown("Fire1")){
  if (remainingNitrous > 0){
       GetComponent.<AudioSource>().PlayOneShot(activateSound, 1);
 
  }
  }
       if (Input.GetButton ("Fire1")){
       if (remainingNitrous > 0){
          Nitrous();
      }
      }
  }
  
  function Nitrous () {
      vehicle.GetComponent.<Rigidbody>().AddForce(transform.forward * 500, ForceMode.Acceleration);
      remainingNitrous -= 1;
     
  }