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