Max value of an Arithmetic Expression using Parentheses

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I want to find the max value of the following expression using Parentheses. Symbols allowed are +, - or *

1-5+3*2-6+3

In the book the answer is given as 57 with the following Parentheses.

(1 -((5+3)*(2-(6+3)))).

There is a - sign before 6. If we put the (..) around 6+3, why is it still -(6+3). Shouldn't it be -(6-3)? So that when we open the (), -3 will become +3. I have same confusion around -((5+3)..