Three. One mid-heeled Franco Sarto pair that I purchased years ago when I was still buying leather. I wear them occasionally. One pair of four inch heeled Stella McCartneys that I purchased last year, which I wear most often. One pair of leather boots that I have never worn. I bought them right before I decided to stop buying leather, and I am saving them for when I am at a point of desperation and my other boots have worn out and I can't find anything that fits. (I don't buy leather now, but I'm not going to throw away leather I have purchased in the past.) I also have two pairs of grey Stella boots, that are the same boot (saving one for when the first pair wears out; they are identical to the black ones except in color), a brown pair that is the same as my old black pair, and another brown leather pair that have never been worn and I am saving.
That's a lot of boots, but when your calves are as big as mine, you have to stock up!