
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
We say that a number is ascending if each of its digits is greater than the digit to its left. For example, 2568 is ascending, and 175 is not. How many ascending numbers are there between 400 and 600?

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