package baekjoon.그리디;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;
class Main1026 {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st;
int N = Integer.parseInt(br.readLine());
Integer[] A = new Integer[N];
Integer[] B = new Integer[N];
st = new StringTokenizer(br.readLine());
for (int i = 0; i < N; i++) {
A[i] = Integer.parseInt(st.nextToken());
}
st = new StringTokenizer(br.readLine());
for (int i = 0; i < N; i++) {
B[i] = Integer.parseInt(st.nextToken());
}
Arrays.sort(A);
Arrays.sort(B, Comparator.reverseOrder());
int ans = 0;
for (int i = 0; i < N; i++) {
ans += A[i] * B[i];
}
System.out.println(ans);
}
}