
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
Xiao Zhang practices calligraphy. The number of characters he writes each day is twice the total number of characters he has written in all previous days. If by the end of the 5th day, Xiao Zhang has completed one-third of the total task, then determine the number of days he should finish the predetermined task.

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