Question

Which number is closest to 19 ?

Answer 1

there is no "closest" number.

19.5? 19.1? 19.0000001?
and so on
18.5? 18.9? 18.9999999?
and so on

There isn't even an integer closest to 19, since both 18 and 20 are the same distance away.

I guess maybe you had some choices offered, but since you did not see fit to share them with us, there's not much we can do.