
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 short of 150 rubles to buy the book, while Tolya was short of 200 rubles. When Vasya borrowed half of Tolya's cash, Vasya was able to buy the book and still had 100 rubles left for the trip. How much did the book cost?

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