
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
On the whiteboard, the numbers are written sequentially:  $1 \ 2 \ 3 \ 4 \ 5 \ 6 \ 7 \ 8 \ 9$ . Andi has to paste a  $+$  (plus) sign or  $-$  (minus) sign in between every two successive numbers, and compute the value. Determine the least odd positive integer that Andi can't get from this process.

Present the answer in LaTex format: \boxed{Your answer}
user