How Many Classified Emails Did Hillary Clinton Send and Receive?

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I don’t want to make a big point about this, but I want to write it down in order to get comments. Here is my understanding of the results of the investigation into Hillary Clinton’s 33,000 emails:

3 were marked classified. Two of these were classified in error. The third was classified correctly but was marked improperly (and was pretty trivial anyway).
110 contained information that wasn’t marked classified, but which Hillary and her aides “should have known” was sensitive. That’s according to FBI Director James Comey. Based on previous reporting, virtually all of these probably related to the drone program in Pakistan, which was classified but had been extensively reported in the press.
About 2,000 emails were retroactively classified as part of the FOIA process.

Is this correct? Or is there some part of this that I continue not to understand?