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: Vec<usize> = vec![0; n+1];
    let mut b: Vec<usize> = vec![0; n+1];
    for i in 0..=n {
        let mut aa = String::new();
        std::io::stdin().read_line(&mut aa).ok();
        let aa: usize = aa.trim().parse().unwrap();
        a[i] = aa;
    }
    for i in 0..=n {
        let mut bb = String::new();
        std::io::stdin().read_line(&mut bb).ok();
        let bb: usize = bb.trim().parse().unwrap();
        b[i] = bb;
    }

    const DIVIDER: usize = 1_000_000_007;
    let mut a_sum: usize = a.iter().sum();
    let mut result: usize = 0;
    for i in 0..=n {
        result += a_sum % DIVIDER * b[i];
        result %= DIVIDER;
        a_sum -= a[n-i];
    }
    println!("{}", result);
}