
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
Anya wants to arrange her model planes in rows with exactly 8 planes in each row. She currently possesses 29 model planes. What is the greatest number of additional planes she must buy in order to be able to arrange all her planes this way?

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