D200 File Number Sequence

When I set-up my D200 I errored in leaving the "File Number Sequence" off, and now I have several shots with the same File Number that I have to re-number before I save them.

I have now turned the File Number Sequence on, but would like to start my File Numbers with something like number 350 so I can avoid having to re-number new shots between 1 and 350. Anyone know how to do this?