You have to pick:

1/3 of 20 is 6.6666..., so I'll assume that rounds up to 7.

Having no sense of touch would mean that all your other sense get better. So your vision gets better, you hear better, and taste is dramatically heightened, and your sense of smell would increase as well. Your body would compensate from losing the sense of touch.

@bryan.dersken: Yep, 7 are going to die