?????????????????7????10??????????????????????
????????7??=3??????(100???????)/??*8=800???????
????????8??=3??????(100???????)/??*18=1800???????
????????9??=3??????(100???????)/??*38=3800???????
????????9??=4??????(500???????)/??*22=11000???????
?????????????7?????800???????*8??=6400???????
??8?????1800???????*8??=14400???????
??9?????3800???????*8??=30400???????
??10?????11000???????*8??=88000???????
??????10???????????????6400???????+14400???????+30400???????+88000???????=139200???????
????????????????????????????????????????40407???????40407????????
