import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        Work[] works = new Work[n];
        for (int i = 0; i < n; i++) {
            works[i] = new Work(sc.nextInt(), 0);
        }
        for (int i = 0; i < n; i++) {
            works[i].b = sc.nextInt();
        }
        Arrays.sort(works);
        long current = 1;
        long ans = 0;
        for (Work x : works) {
            ans += current * x.a;
            ans %= MOD;
            current *= x.b;
            current %= MOD;
        }
        System.out.println(ans);
    }
    
    static class Work implements Comparable<Work> {
        long a;
        long b;
        
        public Work(long a, long b) {
            this.a = a;
            this.b = b;
        }
        
        public int compareTo(Work another) {
            long value = a * (another.b - 1) - another.a * (b - 1);
            if (value == 0) {
                return 0;
            } else if (value > 0) {
                return 1;
            } else {
                return -1;
            }
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}