N = int(input())
S = list(map(int, input().split()))
T = list(map(int, input().split()))
from collections import Counter
cs = Counter(S)
ct = Counter(T)
if cs[2]>0:
  if ct[2]>0:
    print(ct[2]*N+cs[2]*N-ct[2]*cs[2])
  else:
    print(cs[2]*N+cs[1])
else:
  if ct[2]>0:
    print(ct[2]*N+ct[1])
  else:
    print(max(cs[1],ct[1]))