import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int n = sc.nextInt(); int[] orders = new int[n + 1]; for (int i = n; i >= 1; i--) { orders[sc.nextInt()] = i; } BinaryIndexedTree bit = new BinaryIndexedTree(n + 1); long ans = 0; for (int i = 0; i < n; i++) { int idx = orders[sc.nextInt()]; ans += bit.getSum(idx); bit.add(idx, 1); } System.out.println(ans); } } class BinaryIndexedTree { int size; int[] tree; public BinaryIndexedTree(int size) { this.size = size; tree = new int[size]; } public void add(int idx, int value) { int mask = 1; while (idx < size) { if ((idx & mask) != 0) { tree[idx] += value; idx += mask; } mask <<= 1; } } public int getSum(int from, int to) { return getSum(to) - getSum(from - 1); } public int getSum(int x) { int mask = 1; int ans = 0; while (x > 0) { if ((x & mask) != 0) { ans += tree[x]; x -= mask; } mask <<= 1; } return ans; } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public String next() throws Exception { if (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }