Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
B. Balanced Tunnel

time limit per test

1 secondmemory limit per test

512 megabytesinput

standard inputoutput

standard outputConsider a tunnel on a one-way road. During a particular day, $$$n$$$ cars numbered from $$$1$$$ to $$$n$$$ entered and exited the tunnel exactly once. All the cars passed through the tunnel at constant speeds.

A traffic enforcement camera is mounted at the tunnel entrance. Another traffic enforcement camera is mounted at the tunnel exit. Perfectly balanced.

Thanks to the cameras, the order in which the cars entered and exited the tunnel is known. No two cars entered or exited at the same time.

Traffic regulations prohibit overtaking inside the tunnel. If car $$$i$$$ overtakes any other car $$$j$$$ inside the tunnel, car $$$i$$$ must be fined. However, each car can be fined at most once.

Formally, let's say that car $$$i$$$ definitely overtook car $$$j$$$ if car $$$i$$$ entered the tunnel later than car $$$j$$$ and exited the tunnel earlier than car $$$j$$$. Then, car $$$i$$$ must be fined if and only if it definitely overtook at least one other car.

Find the number of cars that must be fined.

Input

The first line contains a single integer $$$n$$$ ($$$2 \le n \le 10^5$$$), denoting the number of cars.

The second line contains $$$n$$$ integers $$$a_1, a_2, \ldots, a_n$$$ ($$$1 \le a_i \le n$$$), denoting the ids of cars in order of entering the tunnel. All $$$a_i$$$ are pairwise distinct.

The third line contains $$$n$$$ integers $$$b_1, b_2, \ldots, b_n$$$ ($$$1 \le b_i \le n$$$), denoting the ids of cars in order of exiting the tunnel. All $$$b_i$$$ are pairwise distinct.

Output

Output the number of cars to be fined.

Examples

Input

5 3 5 2 1 4 4 3 2 5 1

Output

2

Input

7 5 2 3 6 7 1 4 2 3 6 7 1 4 5

Output

6

Input

2 1 2 1 2

Output

0

Note

The first example is depicted below:

Car $$$2$$$ definitely overtook car $$$5$$$, while car $$$4$$$ definitely overtook cars $$$1$$$, $$$2$$$, $$$3$$$ and $$$5$$$. Cars $$$2$$$ and $$$4$$$ must be fined.

In the second example car $$$5$$$ was definitely overtaken by all other cars.

In the third example no car must be fined.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Oct/30/2020 17:23:23 (h1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|