300 ??????3????

2 ??3???????
1 ?????
1/2 ????
1/2 ????

1/4 ???
1/2 ???????
1/2 ????????????
6 ????????????
1 ????????
1 ??????
???
???

1 ??????
1/2 ?????????
2 ????
2 ????
2 ?????

??????
???
?????