The number of morning and middle shift workers is 1, and the number of night shift workers is 3365.25 days, which requires 1826 shifts a year.

Every month 152 classes, each person has to rest for 24 days a year, 3410.25 classes, and 28.5 classes a month (violating the labor law).

Therefore, 513 people need to work in shifts. All employees in this department need about two months' vacation.

How many people are there? Where can I find 1/3? Work in shifts, usually by turns.

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