How to call functions?

Hello, I’ve made a script that tries to access another script to do damage to an enemy and I’ve hit a bump in the road.
I have a script thats attached to my camera which contains a Update function that lets you select an enemy and also it has an else statement. That else statement’s supposed to run a function called HitTarget if you press 1. I keep having a error when I run the game. I don’t get what i’m doing wrong but its probably a simple mistake. Heres the two scripts that i have.

//Targeting.js attached to camera
var target : GameObject; //The target you want to attack
var EnemyTargetted : boolean = false;
public var damage = 7;

public var health = 74;
 
function Update (){
//find the enemy you want to attack
    var hit : RaycastHit;
    if(Input.GetButtonDown("Fire1")){
        var ray : Ray = gameObject.camera.ScreenPointToRay(Input.mousePosition);
        if(Physics.Raycast(ray, hit)){
            if(hit.collider.tag == "Enemy"){
                target = hit.collider.gameObject;
                EnemyTargetted = true;

            }       
            else{
            //normal attack by pressing 1
            if(Input.GetKeyDown ("1")) {
            HitTarget ();
            }
            }        
        }
    }
    
    
}

function HitTarget (damage : int) {
    target.GetComponent(NewBehaviourScript).Hit(damage);
}

Heres the script that the enemy has (still in progress).

var damage = 3;
var InSight : boolean;
var startingHealth = 75;
private var enemyHealth : int;

function Start () {
    enemyHealth = startingHealth;
}

function Hit (damage : int) {
    enemyHealth -= damage;
    if (enemyHealth <= 0) {
        Destroy (gameObject);
    }
}

function OnTriggerEnter (other : Collider){
    if(other.tag == "Player"){
       InSight = true;
    }
}

function OnTriggerExit (other: Collider){
    if(other.tag == "Player"){
        InSight = false;
    }
}

I get this error when i try to run the game :The best overload for the method ‘Targeting.HitTarget(int)’ is not compatible with the argument list ‘()’.

Please help I can’t continue my game without this being fixed.

As the error says, you’re doing “HitTarget()”, but the function you have requires that you supply an int.