
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]


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Class 2 of the second grade has 42 students, including $n$ male students. They are numbered from 1 to $n$. During the winter vacation, student number 1 called 3 students, student number 2 called 4 students, student number 3 called 5 students, ..., and student number $n$ called half of the students. Determine the number of female students in the class.

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