n=int(input())
S=list(map(int,input().split()))
T=list(map(int,input().split()))
s=t=u=v=0
for i,j in zip(S,T):
	s+=(i==1)+(i==2)*n
	t+=(j==1)+(j==2)*n
	u+=(i==2)
	v+=(j==2)
print(max(s,t,(u+v)*n-u*v))