
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]


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Each of the thirty sixth graders has one pen, one pencil, and one ruler. After participating in an olympiad, it turned out that 26 students lost their pen, 23 students lost their ruler, and 21 students lost their pencil. Find the smallest possible number of sixth graders who lost all three items.

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