
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
Let  $s(a)$  denote the sum of digits of a given positive integer a. The sequence   $a_1, a_2,..., a_n, ...$  of positive integers is such that  $a_{n+1} = a_n+s(a_n)$  for each positive integer  $n$ . Find the greatest possible n for which it is possible to have  $a_n = 2008$ .

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