Hi, I used this script on player character

void OnControllerColliderHit(ControllerColliderHit hit) 
{
if(hit.collider.tag=="sword_enemy")
    {
        col="hit";
        live--;
    }
}

but after collide , live shows -189 or more, this result is for one collide not more, how can i fixed it? one collide and one live--

i tried by OnTriggerEnter,too and that result was wrong

this is my complete code

    using UnityEngine;
    using System.Collections;

   public class playerCollid : MonoBehaviour {
    public string col="";
    public int live=5;
    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

    }

    void OnControllerColliderHit(ControllerColliderHit hit) 
    {
    if(hit.collider.tag=="sword_enemy")
        {
            col="hit";
            live--;
        }
    }
    void OnGUI()
    {
        GUI.Label(new Rect(2,2,100,100),live.ToString());
    }
    /*
    void OnTriggerEnter(Collider other) 
    {
        if(other.tag=="sword_enemy")
        {
            print("trigger");
        }

    }
    */
}