n = 0
sum = 0

while True
	input "Enter integral rainfall (99999 to quit): ", i
	if i = 99999 then exit while
	if (i < 0) or (i <> int(i)) then
		print "Must be an integer no less than 0, try again."
	else
		n += 1
		sum += i
		print "  The current average rainfall is "; sum/n
	end if
end while