1
   ( - 5 +     )  -  ( 16  +     -     )  +  17		

2
(   -     )  +  [ 4  +     -  (    + 1 ) ]		       

3
(   -     )  +  [ 3  +     -  (    + 6 ) ]		     

4
      -  [    +  3  +     -  (    + 2 ) ]		

5
[    +      -  (    +    ) +    ] - (   -     )