import java.util.Scanner;

public class InnaAndDima {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int[] notesMaxVolume = new int[n];
        for (int i = 0; i < notesMaxVolume.length; i++) {
            notesMaxVolume[i] = scanner.nextInt();
        }
        int countHappiness = 0;
        for(int maxVolume : notesMaxVolume) {
            int neededVolume = scanner.nextInt();
            if(Math.abs(neededVolume - maxVolume) <= maxVolume && Math.abs(neededVolume - maxVolume) >= 1) {
                countHappiness += maxVolume * (neededVolume - maxVolume);
            } else {
                countHappiness--;
            }
        }
        System.out.println(countHappiness);
    }
}