That's close enough for me, Shell. I was looking for the nearest rounding to 50 really. Was going to give a nudge if required.
422 is the answer. He has been credited with over 1700 but that's really just because he wrote a great many words down first. They were, upon closer scrutiny, thought to be in parlance before he did. Scholars have pinpointed it at 422.
Your turn, Shell.