
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
Lei bought a new book and likes it very much. On the first day, he read $\frac{1}{5}$ of the book plus 12 more pages. On the second day, he read $\frac{1}{4}$ of the remaining pages plus 15 more pages. On the third day, he read $\frac{1}{3}$ of the remaining pages plus 18 more pages. At this point, 42 pages were left unread. What is the total number of pages in the book? $\qquad$ .

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