import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] aArr = new int[n];
        for (int i = 0; i < n; i++) {
            aArr[i] = sc.nextInt();
        }
        Arrays.sort(aArr);
        int[] bArr = new int[n];
        for (int i = 0; i < n; i++) {
            bArr[i] = sc.nextInt();
        }
        ArrayList<Integer> used = new ArrayList<>();
        used.add(Integer.MIN_VALUE);
        used.add(Integer.MAX_VALUE);
        long point = 0;
        for (int i = 0; i < n; i++) {
            int left = 0;
            int right = used.size();
            while (right - left > 1) {
                int m = (left + right) / 2;
                if (used.get(m) < bArr[i]) {
                    left = m;
                } else {
                    right = m;
                }
            }
            used.add(right, bArr[i]);
            int min = 0;
            int max = used.size();
            while (max - min > 1) {
                int m = (min + max) / 2;
                if (used.get(m) < aArr[i]) {
                    min = m;
                } else {
                    max = m;
                }
            }
            point += min;
        }
        System.out.println(point);
    }
}