Orrin, My neighbor years ago had his right leg cut off twice and the left one once.

Certainly no stones will come from this glass house concerning one not being "good at math."

Grammar, however, is another matter. The adjectival expression, "U.S.," rescues the headline from ignominious inclusion in one of those witty Eats, Shoots and Leaves--type books we recently had looked at. The meaning is that there have been three such operation in the U.S., and that this man had the third. Without the "U.S.," the sentence would have implied either that he had had three such operations, or even that somehow he had three hands.