
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 rectangular box has a sum of the lengths of its twelve edges equal to 140, and the distance from one corner of the box to the furthest opposite corner is 21. Calculate the total surface area of the box.

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