public static boolean xp_take(Player p, int var) {
        int exp = 0;
        if ((exp = getTotalExperience(p)) < var) return false;
        setTotalExperience(p, exp - var);
        return true;
    }

    private static int getExpAtLevel(int level) {
        return level <= 15 ? 2 * level + 7 : level <= 30 ? 5 * level - 38 : 9 * level - 158;
    }

    private static int getExpAtLevel(Player player) {
        return getExpAtLevel(player.getLevel());
    }

    private static void setTotalExperience(Player player, int exp) {
        player.setExp(0);
        player.setLevel(0);
        player.setTotalExperience(0);

        int amount = exp;
        while (amount > 0) {
            int expToLevel = getExpAtLevel(player);
            amount -= expToLevel;
            if (amount >= 0) player.giveExp(expToLevel);
            else {
                amount += expToLevel;
                player.giveExp(amount);
                amount = 0;
            }
        }
    }

    private static int getTotalExperience(Player player) {
        int exp = Math.round(getExpAtLevel(player) * player.getExp());
        int currentLevel = player.getLevel();
        while (currentLevel > 0) {
            currentLevel--;
            exp += getExpAtLevel(currentLevel);
        }
        if (exp < 0) exp = Integer.MAX_VALUE;
        return exp;
    }