
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
If you buy 3 pencils, 7 exercise books, and 1 ballpoint pen, the total cost is 6.3 yuan; if you buy 4 pencils, 10 exercise books, and 1 ballpoint pen, the total cost is 8.4 yuan. Find the total cost if you buy 1 pencil, 1 exercise book, and 1 ballpoint pen.

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