[START]
-opt-
:per
30
-optend-
:addcarry
3
̽Ƿ ǰ 
500
30
40
30
[END]
[START]
-opt-
:per
30
-optend-
:addcarry
3
̽Ƿ  
120
7
10
10
[END]
[START]
-opt-
:per
30
-optend-
:addcarry
3
ũ ǰ 
600
40
45
35
[END]
[START]
-opt-
:per
30
-optend-
:addcarry
3
ũ  
100
10
8
10
[END]