
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
Vanya wrote the number 1347 on the board.

- Look! - Petya noticed. - In this number, each of the last two digits is equal to the sum of the two preceding digits.
- Exactly! - Vasya agreed.
- Can you write the largest four-digit number with this property?

Help Vasya solve Petya's task.

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