private int numberOfEnemiesToFight(int number){
        int res = 0;
        for (int i = 0; i < beings.size(); i++){
            if (((beings.get(i).isZombie() && beings.get(number).isHuman()) || (beings.get(i).isHuman() && beings.get(number).isZombie())) && getDistance(i, number) < RADIUS_FIGHT){
                res++;
            }
        }

        return res;
    }