
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
In a certain seventh-grade class, 15 students received an "excellent" grade in Chinese, 18 students received an "excellent" grade in Mathematics, 8 students received an "excellent" grade in both subjects, and 20 students did not receive an "excellent" grade in either subject. How many students are there in this class in total?

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