
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
A factory's reservoir has a leakage problem. If one pump is used to fill the reservoir, it takes 8 hours to fill it when it's empty. If two identical pumps are used to fill the reservoir, it only takes 3.2 hours to fill it when it's empty. To fill the reservoir within 2 hours, how many such pumps are needed at least?

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