public void Update()
{
if (times < 30 && flag == 0)
{
if (interval <= 0)
{
interval = Random.Range(3, 5);
times++;
int num = Random.Range(1, 4);
for (int i = 0; i < num; i++)
{
factory.produceUFO();
}
}
interval -= Time.deltaTime;
}
}