use std::io::Read;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let a: Vec<i32> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();
    let b: Vec<i32> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();

    let mut ans: i32 = 2000;
    for i in 0..n {
        let mut tmp: i32 = 0;
        let mut pq = std::collections::BinaryHeap::new();
        for j in 0..n {
            pq.push((-a[j], 0))
        }
        for j in 0..n {
            let (mut level, mut count) = pq.pop().unwrap();
            level *= -1;
            count *= -1;
            level += b[(i + j) % n] / 2;
            count += 1;
            tmp = std::cmp::max(tmp, count);
            pq.push((-level, -count));
        }
        ans = std::cmp::min(ans, tmp);
    }
    println!("{}", ans);
}