N, *AB = map(int, open(0).read().split())
AB = list(zip(AB[:N], AB[N:]))

a, b = AB[0]
ans = a ^ b
for (a1, b1), (a2, b2) in zip(AB, AB[1:]):
    if a1 == b1 and a2 != b2:
        ans += 1

print(ans)