20???100 ???? ????? ??! ????????? 20???100 -20 ??? 100 ??? ?????????? ??? ?????? ??? ????? ?????? ????? ???? ????????? ??? ??? ?????????? ? ????????? ????? ?????????? user-friendly ???????? ????????! 20 ??? ????? 100 ??? ????? ?????????? ??????? ???????? ????? ????? ???? ?????? ??????? ?????? 20 ??? 100 : ????