n = int(input())
a, b = [[*map(int, input().split())] for _ in range(2)]

for i, bi in enumerate(b):
    a[i] = (a[i] + bi) % 2

flg = True
cnt = 0
while len(a) > 0:
    if a.pop() == 1:
        if flg:
            cnt += 1
            flg = False
    else:
        flg = True

print(cnt)