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

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());
        }
        for (int i = 0; i < n; i++) {
            works[i].b = sc.nextInt();
        }
        Arrays.sort(works);
        long base = 1;
        long income = 0;
        for (Work x : works) {
            income += x.a * base % MOD;
            income %= MOD;
            base *= x.b;
            base %= MOD;
        }
        System.out.println(income);
    }
    
    static class Work implements Comparable<Work> {
        long a;
        long b;
        
        public Work(long a) {
            this.a = a;
        }
        
        public int compareTo(Work another) {
            long left = a + b * another.a;
            long right = another.a + another.b * a;
            if (left == right) {
                return 0;
            } else if (left < right) {
                return 1;
            } else {
                return -1;
            }
        }
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    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 String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}