N = int(input())
S = list(map(int,input().split()))
T = list(map(int,input().split()))
ans_s = 0
ans_t = 0
for i in S:
    if i == 1:
        ans_s+=1
    elif i == 2:
        ans_s += N
for j in T:
    if j == 1:
        ans_t+=1
    elif j == 2:
        ans_t += N
print(max(ans_s,ans_t))