???? ?????? ????? ???????? ????? ???? ???? ??? ????, ???? ?? ????? ?? ??? ???? ????. ??? ??? ???? ???? ?? ??? ???? ?? ??? ????? ????? ????? ???. ??? 1: ??? ??? ?????? ??? ? ???? ????? ???? ??? ???. ??? 2: ??? ??? ???? ? {??? ?? ????, ?? ???? ???? ???? ???? ??? ????? ????? ???. ??? 3: ??? ??? ???? ???? ???? ? ???? ??????? ???? ????