n = int(input())
s = list(map(int, input().split()))
t = list(map(int, input().split()))
s1 = s.count(1)
t1 = t.count(1)
s2 = s.count(2)
t2 = t.count(2)
if s2 > 0 and t2 > 0:
  print(n * (s2 + t2) - (s2 * t2))
elif s2 > 0:
  print(n * s2 + s1)
elif t2 > 0:
  print(n * t2 + t1)
else:
  print(max(s1, t1))