x12 on the pic, photos are free, high blood pressure is not....
another trick I use is when I take two things apart, i try to put the screw back into the threaded bit so I KNOW where it came from.
Cardboard from a box can also be used, poke a small hole, then stuff the screw/bolt in, make a note under it where it came from. (I started doing this when I was rebuilding laptops with a zillion screws. )