
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
Mathematicians Andrey, Boris, and Viktor were solving olympiad problems. First, Andrey solved several problems, then Boris solved one-third of the remaining problems. After that, one-third of the problems were still unsolved, and Viktor finished solving them. What fraction of all the problems did Andrey solve?

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