
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
Let  $M$  be a subset of the set of  $2021$  integers  $\{1, 2, 3, ..., 2021\}$  such that for any three elements (not necessarily distinct)  $a, b, c$  of  $M$  we have  $|a + b - c | > 10$ .
Determine the largest possible number of elements of  $M$ .

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