Six...I didn't tell you because I thought it might go to your head...but, compared to the usual 3.12%, I use 95.959595% of my brain when I talk to you!
I would use 100% but I lent 4.040405% to a friendly bird I encountered years ago on my journey from Xanadu. She promised not to use what I gave her for evil, I promised to use what was left to be more attentive to good fellows.