N=int(input())
S=list(map(int,input().split()))
T=list(map(int,input().split()))
if 2 in S and 2 in T:
	print((S.count(2)+T.count(2))*N-S.count(2)*T.count(2))
elif 2 not in S and 2 not in T:
	print(max(S.count(1),T.count(1)))
else:
	if 2 in T:
		S,T=T,S
	print(S.count(2)*N+S.count(1))