
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
A subset of  $\left\{1,2,3,\ldots,2017,2018\right\}$  has the property that none of its members are  $5$  times another. What is the maximum number of elements that such a subset could have?

*2018 CCA Math Bonanza Lightning Round #4.2*

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