import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    long mod = (long)Math.pow(10, 9) + 7;
    long[] a = new long[n + 1];
    long[] bsum = new long[n + 1];
    for(int i = 0; i < n + 1; i++) {
      a[i] = sc.nextLong();
    }
    bsum[0] = sc.nextLong();
    for(int i = 1; i < n + 1; i++) {
      long t = sc.nextLong();
      bsum[i] = (bsum[i - 1] + t) % mod; 
    }
    long ans = 0;
    for(int i = 0; i < n + 1; i++) {
      long t = (a[i] * bsum[n - i]) % mod;
      ans = (ans + t) % mod;
    }
    System.out.println(ans);
  }
}