fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn main() {
    let n = read::<usize>() + 1;
    let mut a = vec![0i128; n];
    let mut b = vec![0i128; n];
    let big_int = 1000_000_000 + 7;
    for i in 0..n {
        a[i] = read();
    }
    for i in 0..n {
        b[i] = read();
    }
    let mut b_sum = vec![0; n];
    for i in 0..n {
        b_sum[0] += b[i];
        b_sum[0] %= big_int;
    }
    for i in 1..n {
        b_sum[i] %= big_int;
        b_sum[i] = b_sum[i - 1] - b[n - i];
    }
    let mut ans: i128 = 0;
    for i in 0..n {
        ans += a[i] * b_sum[i];
        ans %= big_int;
    }
    ans += big_int;
    ans %= big_int;
    println!("{:?}", ans);
}