use proconio::input;

fn main() {
    input! {
        n:usize,
        a:[usize;n],
        b:[usize;n],
    }

    let mut c = (0..n)
        .map(|i| ((b[i] - 1) as f64 / a[i] as f64, i))
        .collect::<Vec<_>>();
    c.sort_by(|x, y| y.0.partial_cmp(&x.0).unwrap());

    let mut ans = 0;
    let mut level = 1;
    for &(_, id) in c.iter() {
        ans += level * a[id];
        ans %= MOD;
        level *= b[id];
        level %= MOD;
    }

    println!("{}", ans);
}

const MOD: usize = 1000000007;