
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
A shopping mall is offering a discount promotion for customers based on the total payment amount for a single shopping trip, as follows:
1. If the total payment does not exceed 200 yuan, no discount is offered.
2. If the total payment exceeds 200 yuan but does not exceed 500 yuan, a 10% discount is applied to the standard price.
3. If the total payment exceeds 500 yuan, the first 500 yuan is subject to the discount mentioned in point 2, and the amount exceeding 500 yuan is offered a 30% discount.

A person shopped twice, paying 168 yuan and 423 yuan respectively. Assuming they purchase the same items in a single trip, the total payment would be ______ yuan.

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