14.
Rune Factory 3 is a maaaaaajor step-up from Rune Factory. I can't say much because I myself never played the first Rune Factory, but my sister spoke about how 3 is better than 1 and 2, and that she pretty much gave up on 1 and hasn't bothered trying to get through 2 yet because you have to marry before you begin the plot. In her opinion (which is mine as well) Rune Factory 3 pretty much perfects the whole 'you lost your memory' story, and the creators of RF was actually smart and decided to move on from the lost memory storyline with Rune Factory Oceans.
Not to mention that Rune Factory 3 has the most adorable main character that turns into a golden wooly, and other than the heroine (ironically imo) the other bachelorettes are the best ones I've seen in a Rune Factory game.
Honestly, the fact that I'm so engrossed in RF3 should really tell you how much better it is than the original. Hell, my sister accidentally corrupted the file I was playing on and I had to start from the beginning. Now I'm almost back to where I was before.
/totally trying not to talk about how RF3 reminds her of ToS sometimes.