????:1?????????:????????

2????????

3?????sn????

4?????????150

5?????

2????????1???????????????????,????????????????????????? ??????????????????????? ? 2??????????????????1?,????? ? ? 2???1?,????????? ? ????? 2???1???,?????????? ????? ? 2???1??????????????????,?????????? ??? ???????? 2?1????????,?,??????????????????????????? ? ?? 2?????1????????????????????,?????????????? ?????? ???????????????????????? 2?????1????????,?????????? ????? ? 2?1?????????????????,?????????????????????????????????????????????? ? ? 2?????1?,??????? ????? ???????? 2?1?????,???????????? ???????? ????? ??:??