n=int(input())
s=list(map(int,input().split()))
t=list(map(int,input().split()))
s2=s.count(2)
t2=t.count(2)
ans=(s2+t2)*n-(s2*t2)
if 2 in s and 2 in t:
  print(ans)
elif 2 in s:
  ans+=s.count(1)
  print(ans)
elif 2 in t:
  ans+=t.count(1)
  print(ans)
else:
  ans+=max(s.count(1),t.count(1))
  print(ans)