Calling All Stattos...

(Before I even begin, I'm having a mental debate about the correct pluralisation of Statto. I've gone with Stattos because it's a name, but it still feels that Stattoes might not be wrong either. Happily, there's no call for a possessive or an omissive apostrophe, so that's good news.)
Anyhoo. Let's move on to the business in hand. It's one for the number nerds today. 
Please insert the missing
 S at your convenience.I am not a fan of numbers. I realise that's a fairly broad statement...