
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
Murtha decides to extend her pebble collection for 20 days instead of 12 days, collecting pebbles in the same manner (one more pebble each day). How many pebbles will she have collected by the end of the twentieth day?

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