
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
There are 25 students in a school club where they can participate in chess, music, or art classes. Each student must join at least one of these activities, and it's possible for students to join two or all three activities. There are 12 students in chess, 15 in music, and 11 in art. A total of 11 students are participating in at least two activities. Determine the number of students who are enrolled in all three activities.

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