Five:
-- Two high, just on either side of the turn indicators
-- Two low, by the lower outside corners
-- One behind the clock.
Your lower left and center (clock) are out. Might as well replace them all; if two have gone the rest aren't far behind. 194 bulbs from any auto parts store work well.
The bulbs in there are white bulbs covered with little green condoms. You may or may not be able to get the condoms off and onto a new bulb - I had a couple tear. Fortunately, I don't care for the sickly green anyway. I replaced them with amber bulbs and find that much more appealing.
