use std::cmp::Ordering;

const MOD: usize = 1e9 as usize + 7;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let mut b = String::new();
    std::io::stdin().read_line(&mut b).ok();
    let b: Vec<usize> = b.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut orders = (0..n).collect::<Vec<usize>>();
    orders.sort_by(|&i, &j| {
        let left = a[i] + b[i] * a[j];
        let right = a[j] + b[j] * a[i];
        if left > right {
            Ordering::Less
        } else {
            Ordering::Greater
        }
    });
    let mut result = 0usize;
    let mut level = 1usize;
    for &i in orders.iter() {
        result += a[i] * level % MOD;
        result %= MOD;
        level *= b[i];
        level %= MOD;
    }
    println!("{}", result);
}