The elves will owe the MC big time. I hope they are honourable enough to remember it.
It's interesting how despite the whole world, more or less, now using the Western Arabic numerals, the underlying systems in languages affect the use of the digits is many ways. Just in Europe there are many kinds of differences. Between my native tongue of Finnish and then English, for example, in English people often say "fourteen hundred", meaning 1,400, but in Finnish pretty much nobody ever says that, it's always "a thousand four hundred" (translated literally). So, knowing this, when I saw those numbers on the map, I immediately thought the Japanese system must have a way of using 10,000s as a base.