
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
Currently, there are 1990 piles of stones, with each pile consisting of $1, 2, \cdots, 1990$ stones. In each round, you are allowed to pick any number of piles and discard the same number of stones from each of the selected piles. What is the minimum number of rounds required to discard all the stones?

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