Funny, as we created FairSoftware exactly for your purpose: with extremely low overhead (about 5 clicks for you, no paperwork, no fee, no nothing else), you can formalize a deal with your other buddies, creating in effect a virtual company with the 3 of you, each with your amount of equity. You could just go for 90% for you and 5% each for the other two.
However, to address your question about what is "fair": the consideration that matters most in business is looking into the future: will you need either of those contributors moving forward? From the sound of your question, I'm guessing not.
I would still assume that you are slightly exaggerating when you say that they contributed 5% each only. 5% is a very low number. Often, lines of code are not the right metric. For instance, someone may have contributed the original idea and never written a line of code.
So let's pretend that it's more like you deserve 75% and they should split the rest? Either way, your best course of action is to talk to them and see how they feel. Really, it's that simple.
They may say: "be our guest, create your company, good luck and mention us if you succeed". Or they could say: "we want 50% of any revenue you make, it was our idea". Or anything in between.