If the numbers 1 to 5 are written out in words:
one, two, three, four, five, then there are
\(3 + 3 + 5 + 4 + 4 = 19\) letters used in total.

If all the numbers from 1 to 1000 (one thousand)
inclusive were written out in words, how many
letters would be used?

NOTE: Do not count spaces or hyphens. For example,
342 (three hundred and forty-two) contains 23
letters and 115 (one hundred and fifteen) contains
20 letters. The use of "and" when writing out
numbers is in compliance with British usage.