SICP

I'm now readin SICP.Its not a bad book at all.
Its notation however sucks:
(+ (* 3 (+ (* 2 4) (+ 3 5))) (+ (- 10 7) 6))
There is no way i could see which empty)( places contain which operators without reading entire string piece by piece.
This wouldn't work with larger strings.

>>44
What would you push in between numbers? Space?

1 + 2 + 3 + 4 + 5 =: 10 keypresses
1 enter 2 + 3 + 4 + 5 +: 10 keypresses
+ 1 space 2 space 3 space 4 space 5 closeparen: 11 keypresses