
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
The sum of the numbers on each pair of opposite faces is equal, and the middle number in this range is the largest number on one of the faces, where the numbers on the faces are consecutive whole numbers between 15 and 20. Calculate the sum of all the numbers on this cube.

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