
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
Mary sells machines, selling 1 machine on the first day, 3 machines on the second day, 5 machines on the third day, and so on, with each day selling 2 more machines than the previous day. Calculate the total number of machines she has sold after 20 days.

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