Как в Unity правильно пишется условие с bool?

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
 
public class TIMECounter : MonoBehaviour {
    public Text Count_Resut;
    public bool count_script = false;
    private int Count_Day = 5, Count_H = 0, Count_M = 0, Count_S = 3, Count_MS = 0;
    void OnMouseDown (){
        count_script = true;
        }
    void Update() {
        if (count_script = true){
            Count_MS = Count_MS - 1;
            if (Count_MS == -1) {
                Count_S = Count_S -1;
                Count_MS = 34;
            }
            if (Count_S == -1) {
                Count_M = Count_M -1;
                Count_S = 59;
            }
            if (Count_M == -1) {
                Count_H = Count_H -1;
                Count_M = 59;
            }
            if (Count_M == -1) {
                Count_H = Count_H -1;
                Count_M = 59;
            }
            if (Count_H == -1) {
                Count_Day = Count_Day -1;
                Count_H = 23;
            }
            if (Count_Day==0 & Count_H==0 & Count_M==0 & Count_S==0){
                Count_Resut.text = "Вы мертвы! Ваше время истекло!";
            } 
        } else {
            Count_Resut.text = Count_Day + ":" + Count_H + ":" + Count_M + ":" + Count_S + "." + Count_MS;
        }
    }
}

void Update() {
        if (count_script = true){

if (count_script)