use std::{cmp::Reverse, collections::BinaryHeap};

use proconio::input;

fn main() {
    input! {
        n: usize,
        a: [usize; n],
        b: [usize; n],
    }
    let mut ans = usize::MAX;
    for i in 0..n {
        let mut pq = BinaryHeap::new();
        for j in 0..n {
            pq.push(Reverse((a[j], 0)));
        }
        let mut cur = 0;
        for jj in 0..n {
            let j = (i + jj) % n;
            if let Some(Reverse((mut x, mut y))) = pq.pop() {
                x += b[j]/2;
                y += 1;
                cur = cur.max(y);
                pq.push(Reverse((x, y)));
            }
        }
        if ans > cur {
            ans = cur;
        }
    }
    println!("{}", ans);
}