Problems with health system based on hearts

Hey there! I'm trying to make a simple thing: damage. I'm using a Hearts System for the Player Health like in Zelda games, but it keeps telling me that "Assets/Scripts/Working Scripts/HeartSystem.cs(63,17): error CS0266: Cannot implicitly convert type "float" to "int". An explicit conversion exists (are you missing a cast?)".

HeartSystem Script:

 private int maxHeartAmount = 10;
 public int startHearts = 3;
 public int curHealth;
 private int maxHealth;
 private int healthPerHeart = 2;

 public Image[] healthImages;
 public Sprite[] healthSprites;

 void Start () {
     curHealth = startHearts * healthPerHeart;
     maxHealth = maxHeartAmount * healthPerHeart;
     checkHealthAmount ();
 }
 
 void checkHealthAmount () {
     for (int i = 0; i < maxHeartAmount; i++) {
         if (startHearts <= i) {
             healthImages [i].enabled = false;
         } else {
             healthImages [i].enabled = true;
         }
     }
     UpdateHearts ();
 }

 void UpdateHearts(){
     bool empty = false;
     int i = 0;
     foreach (Image image in healthImages){
         if (empty) {
             image.sprite = healthSprites [0];
         } else {
             i++;
             if (curHealth >= i * healthPerHeart) {
                 image.sprite = healthSprites [healthSprites.Length - 1];
             } else {
                 int currentHeartHealth = (int)(healthPerHeart - (healthPerHeart * i - curHealth));
                 int healthPerImage = healthPerHeart / (healthSprites.Length - 1);
                 int imageIndex = currentHeartHealth / healthPerImage;
                 image.sprite = healthSprites [imageIndex];
                 empty = true;
             }
         }
     }
 }

 public void TakeDamage(float amount){
     curHealth -= amount;
     curHealth = Mathf.Clamp (curHealth, 0, startHearts * healthPerHeart);
     checkHealthAmount ();
 }

 public void AddHeartContainer(){
     startHearts++;
     startHearts = Mathf.Clamp (startHearts, 0, maxHeartAmount);
     checkHealthAmount ();
 }

Damage script:

 float damage = -5f;
 void OnTriggerEnter(Collider other){{
         other.gameObject.GetComponent<HeartSystem> ().TakeDamage (damage);
     }

}

Thx for the help :)