500
What are the first 4 phases of the moon?
full moon, new moon, waxing gibbous, waxing crescent
new moon, waxing crescent, half moon, waxing gibbous
waxing crescent, half moon, waning gibbous, new moon
new moon, waning crescent, half moon, waxing gibbous
new moon, waxing crescent, half moon, waxing gibbous