
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 continues her pebble collection with the same strategy, collecting one pebble on the first day and increasing the count by one each day. However, on the 15th day, she decides to double the number of pebbles she would normally collect. How many pebbles will she have collected at the end of the fifteenth day?

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