It keeps him on his toes.

A Long Island ballroom-dance instructor doesn’t know the meaning of de-feet — running six marathons barefoot, including four in New York City.

“I do get, periodically, a little shard of glass or something in my foot, and what I say is that that’s what the bib pins are for,” quipped 57-year-old shoeless sensation John Mazzei of Lindenhurst to The Post.

“I could perform minor surgery on my feet now.”

Mazzei is used to getting looks, including during training, stomping on jagged roadside pebbles and other debris while running on the island’s bustling streets.

“I actually one time got pulled over by a police officer while I…

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