
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
In a bookstore, Vasya and Tolya were interested in a book. Vasya was 150 rubles short to buy the book, and Tolya was 200 rubles short. When Vasya borrowed half of Tolya's money, Vasya was able to buy the book and still had 100 rubles left for transportation. How much did the book cost?

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