import java.util.Arrays;
import java.util.Scanner;

public class MaxDotProd {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = scanner.nextInt();
        }
        int[] b = new int[n];
        for (int i = 0; i < n; i++) {
            b[i] = scanner.nextInt();
        }
        System.out.println(getMaxDotProduct(a, b));
    }

	public static long getMaxDotProduct(int[] a, int[] b) {
		Arrays.sort(a);
		Arrays.sort(b);
		long result = 0;
		for (int i = 0; i < b.length; i++) {
			result = (long) a[i] * b[i] + result;
		}
		return result;
	}

}