Drill holes in cover plates

In my 3dmodel I have quite big area covered by plates. There are many holes 5.6 mm for bolts drilled in plates. I do not want to insert bolts in all these places, I simply need to calculate total amount of drilled holes to calculate bolts for them.

Is there a way to find out this amount of these holes?

The best, if I can calculate this depending on the diameter of holes.

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