5
1 2
- 3
* 2
5 4
+ 1
- 2
* 3
/ -2
1000 7
* -1000
* -1000
* 1000
* 1000
* 1000
* 1000
* 1000
-1 3
- -1
* 0
/ -1
0 1
+ 0
