import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))

def main():
    mod=10**9+7
    N=I()
    S=LI()
    T=LI()
    
    def calc(S):
        temp=0
        for i in range(N):
            if S[i]==1:
                temp+=1
            elif S[i]==2:
                temp+=N
        return temp
        
    ans=max(calc(S),calc(T))
    print(ans)
    
    


main()