
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
In the expression $5 * 4 * 3 * 2 * 1 = 0$, replace the asterisks with the four arithmetic operation signs (using each sign exactly once) so that the equation becomes valid. Other signs, including parentheses, cannot be used.

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