
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 person plans to establish a long-term savings plan, depositing 20,000 yuan at the beginning of each year for 6 consecutive years, then changing to 10,000 yuan per year for the next 7 consecutive years at an annual interest rate of 2%. Calculate the sum of principal and interest at the beginning of the 13th year.

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