private int playerMaterialAmount(Player p, Material m) {
        int materialCount = 0;
        ItemStack[] contents;
        for (int length = (contents = p.getInventory().getContents()).length, k = 0; k < length; ++k) {
            final ItemStack i = contents[k];
            if (i != null) {
                if (i.getType().equals((Object) m)) {
                    if (!i.hasItemMeta()) {
                        materialCount += i.getAmount();
                    } else {
                        int am = i.getAmount();
                        i.setAmount(0);
                        i.setType(m);
                        i.setAmount(am);
                        materialCount += i.getAmount();
                    }
                }
            }
        }
        return materialCount;
    }