
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
Jimmy now starts climbing the stairs, and it takes him 30 seconds to climb the first flight. Each subsequent flight takes 10 seconds more than the previous flight. How long will it take him to climb the first four flights of stairs?

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