What is the number of pit stops and division of labor of formula F 1?

The necessary personnel for normal pit stop are: lollipop man-1 person, front and rear jacks -2 people to change tires, and 3 people for each tire (1 person to load and unload, 1 person to use pneumatic wrench-12 person to use fire extinguisher-1-2 person to use electronic guns (to prevent the car from stalling).