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