Today's question is worth 320 points. However, if you are the winner and you can tell the significance of 320 points, you get an extra 100 points. And if you are the winner and your username has a P in it, you get an extra 100 points. And if you are the winner and your username begins with P, you get another 100 points. As you may have guessed, Persi came up with today's question. Do not worry, we will have other special letter days!

.How many Top Cats are there whose username begins with the letter P

There are 620 points available today but only if you supply the clicks you used to find the answers.