
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
There is a syllogism reasoning as follows: "For a differentiable function $f(x)$, if $f'(x_0) = 0$, then $x = x_0$ is an extremum point of the function $f(x)$; since the derivative of the function $f(x) = x^3$ at $x = 0$ is $f'(0) = 0$, therefore, $x = 0$ is an extremum point of the function $f(x) = x^3$." Among the reasoning above  
(1) The major premise is wrong; (2) The minor premise is wrong; (3) The form of reasoning is correct; (4) The conclusion is correct  
You think the correct number is ______.

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