#Facebook problem using lists
def facebook_time():
	hours_list=[]
	above_4_list=[]
	hours=float(input("enter hours on Facebook "))
	while(hours>0):
		hours_list.append(hours)
		if(hours>=4):
			above_4_list.append(hours)
		hours=float(input("enter hours on Facebook "))
	print("hours list")
	print(hours_list)
	print("hours above 4 list")
	print(above_4_list)
	return sum(hours_list), len(above_4_list)
def main():
	total, c_above4=facebook_time()
	if(total==0):
		print("nobody used Facebook")
	else:
		print("total hours on Facebook", total)
		if(c_above4==0):
			print("nobody spent 4 hours or more")
		else:
			print(c_above4, "people spent 4 hours or more")
main()