Robots Slice Apples?

Robots are used to prepare bags of sliced apples. One particularly bad robot gets tired as his power starts to run low, so making the $$k$$th bag takes the robot $$k+4$$ actions.

For example, the robot can make the 1st bag with just 5 actions, but by the 100th bag, it takes the robot 104 actions. The total number of actions needed to make $$n$$ bags of sliced apples (for large $$n$$) is:

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