def main():
    N = int(input())
    A = list(map(int, input().split()))
    B = list(map(int, input().split()))
    A_num = int("0b" + "".join(map(str, A)), 0)
    B_num = int("0b" + "".join(map(str, B)), 0)

    left_idx = 0
    right_idx = N - 1

    ctr = 0
    while A_num ^ B_num:
        left_idx = N - len(format(A_num ^ B_num, "b"))
        right_idx = left_idx + format(A_num ^ B_num, "b").rfind("1")
        mask = int(
            "0b"
            + "1"*(right_idx-left_idx+1)
            + "0"*(N-right_idx-1), 0)
        A_num = A_num ^ mask
        ctr += 1

    print(ctr)


if __name__ == "__main__":
    main()