
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 many things, always urgent; the world turns, time presses. Ten thousand years is too long, we should only strive for the moment." Through this poem "Man Jiang Hong" and "Comrade Guo Moruo", a great man tells us young students: cherish every minute and second; work hard, study hard. A day consists of $86400$ seconds. Express this number in scientific notation as ______.

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