
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
Each of the first two digits must be 1, 2, 4, or 5, the last two digits must be 5, 6, or 7, and the last two digits must not be the same. Calculate the number of 4-digit positive integers satisfying these conditions.

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