
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
All paths in the park are one meter wide and are made up of whole square tiles measuring one meter by one meter, which are closely adjacent to each other. The paths, where all tiles need to be replaced, are schematically represented in the image.

How many tiles need to be replaced?

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