
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 are 900 three-digit numbers $(100, 101, \cdots, 999)$. Each number is printed on a card; some of these numbers, when seen upside-down, still appear as three-digit numbers. For example, when 198 is seen upside-down, it still appears as a valid three-digit number. Therefore, at most $\qquad$ cards can be omitted from printing.

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