
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
An unexpected event has a 0.3 probability of occurring without any preventive measures and will cause a loss of 4 million yuan if it occurs. There are two independent preventive measures, A and B, available for selection. The costs of preventive measures A and B alone are 450,000 yuan and 300,000 yuan, respectively. After adopting the preventive measures, the probabilities of the event not occurring are 0.9 for measure A and 0.85 for measure B. If the preventive scheme allows A and B to be used individually, together, or not at all, determine the preventive scheme that minimizes the total cost (total cost = cost of preventive measures + expected loss from the unexpected event).

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