
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 mall offers discounts to customers under the following conditions: (1) If the shopping amount does not exceed 200 yuan, no discount is offered; (2) If the shopping amount exceeds 200 yuan but does not exceed 500 yuan, a 10% discount is applied to the original price; (3) If the shopping amount exceeds 500 yuan, the first 500 yuan will receive the discount mentioned in (2), and the amount exceeding 500 yuan will receive a 20% discount. A person shopped twice, paying 148 yuan and 423 yuan respectively. If you purchase the same items, you would choose to buy them all at once, and you would only need to pay     yuan.

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