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