Need help with an image...

Hello, Swaggers!
I'm working on a deckplan of an exceedingly large ship, roughly circular. My problem is that I use Paint and I can't use the circle drawing utility for a circle large enough to *start* the plan at a scale that would be useful. I hope someone can help me with this.
I need a circle (same width as length), black, a single pixel wide, 3400 pixels across. Later, I'd like to be able to ask for a few more circles of smaller diameter, once I sort out the internal arrangement.

Thanks for any and all help!

V-Man
"All I need is more ammo, a little water, and some chips if you got them."