import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] A = new int[n];
        int[] B = new int[n];

        for (int i = 0; i < n; i++) A[i] = sc.nextInt();
        for (int i = 0; i < n; i++) B[i] = sc.nextInt();

        Arrays.sort(A); // ascending
        Arrays.sort(B); // ascending

        int sum = 0;
        for (int i = 0; i < n; i++) {
            sum += A[i] * B[n - 1 - i]; // pair smallest A with largest B
        }

        System.out.println(sum);
    }
}