????? ??????? ??? ???? ??????? ??????????? ????????? ? ??????? ??????? ?????? variate ???????. ?????? ?????????? ??????? ??? ???? ??????? ??????????? ??????? ??? ?????????? ????? ?????? ??????. ?????? ???????????: ????? ??????? ???????? ????? ?????? ??????????? ????? ????? ??????? ??????? ??????