
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
How much did the book actually cost? One ruble was paid for the book, and the remaining amount to be paid is the same as what would remain to be paid if the amount paid was the remaining amount. How much was paid for the book?

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