public void UpArrowDamage()
{
if (coin >= upCostArrowDamage)
{
lm.SetCoin(lm.GetCoin() - upCostArrowDamage);
coin = lm.GetCoin();
coinText.text = coin.ToString();
lm.SetDamage(lm.GetDamage() + 2);
arrowDamageText.text = lm.GetDamage().ToString();
}
}