
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
There are 1990 piles of stones, with the number of stones in each pile being $1, 2, \cdots, 1990$. You can perform the following operation: in each step, you can choose any number of piles and remove the same number of stones from each of the chosen piles. What is the minimum number of steps required to remove all the stones from all the piles?

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