???????: - ?? ????? ????? ?????? ??? ??? ?????? ?????? ???? ???? ??? ??? ?? ?? ??? ???? ?? ????? ?????? ?????? ??????.???????? (?????) ??????? (?) ??? ??? ?????? ???? ??????? ????????? ??? ??? ????? ???? ??? ????? ????? ???????.As numbers get larger, psychological calculations get more challenging. And if Young ones are going to be proficient in ma