
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
Given the following questions:  
① Find the perimeter of an equilateral triangle with an area of 1;  
② Calculate the arithmetic mean of three numbers entered on a keyboard;  
③ Find the smaller of two numbers entered on a keyboard;  
④ Calculate the value of the function $$f(x)= \begin{cases} 2x, & \text{if } x≥3 \\ x^{2}, & \text{if } x＜3\end{cases}$$ when the independent variable is $x_0$.  
Among these, the problems that do not require the description of an algorithm using conditional statements are __________.

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