public void UpMaxArrow()
{
if (coin >= upCostMaxArrow)
{
lm.SetCoin(lm.GetCoin() - upCostMaxArrow);
coin = lm.GetCoin();
coinText.text = coin.ToString();
lm.SetMaxArrow(lm.GetMaxArrow() + 1);
maxArrowText.text = lm.GetMaxArrow().ToString();
}
}