n=int(input())
s=list(map(int,input().split()))
t=list(map(int,input().split()))
ans=0
cnt_s1=0
cnt_s2=0
cnt_t1=0
cnt_t2=0
for val in s:
    if val==1:
        cnt_s1+=1
    if val==2:
        ans+=n
        cnt_s2+=1
for val in t:
    if val==1:
        cnt_t1+=1
    if val==2:
        ans+=(n-cnt_s2)
        cnt_t2+=1
if cnt_s2==0 and cnt_t2==0:
    print(max(cnt_s1,cnt_t1))
elif cnt_s2==0 and cnt_t2!=0:
    print(ans+cnt_t1)
elif cnt_s2!=0 and cnt_t2==0:
    print(ans+cnt_s1)
elif cnt_s2!=0 and cnt_t2!=0:
    print(ans)