import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.Scanner;

public class Program {
	public static void main(String[] args) {
		new Magatro().solve();
	}
}

class Magatro {
	private int n;
	private int[] a, b;
	private PriorityQueue<Mon> priorityQueue;
	private int anser = Integer.MAX_VALUE;

	private void scan() {
		Scanner scanner = new Scanner(System.in);
		n = scanner.nextInt();
		a = new int[n];
		b = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = scanner.nextInt();
		}
		for (int i = 0; i < n; i++) {
			b[i] = scanner.nextInt();
		}
	}

	private void battle(int start) {
		int result = -1;
		PriorityQueue<Mon> copyPq = new PriorityQueue<Mon>(priorityQueue);
		for (int i = 0; i < n; i++) {
			int index = (i+start)%n;
			Mon mon = copyPq.poll();
			mon.battle++;
			result = Math.max(mon.battle, result);
			if(anser<=result)return;
			mon.level += b[index]/2;
			copyPq.add(mon);
		}
		anser = result;
	}

	public void solve() {
		scan();

		priorityQueue = new PriorityQueue<>(1, new MyComparator());
		for (int i : a) {
			priorityQueue.add(new Mon(i));
		}
		
		for(int i=0;i<n;i++){
			battle(i);
		}
		System.out.println(anser);
	}
}

class MyComparator implements Comparator<Mon> {
	public int compare(Mon a, Mon b) {
		if (a.level != b.level) {
			return Integer.compare(a.level, b.level);
		} else {
			return Integer.compare(a.battle, b.battle);
		}
	}
}

class Mon {
	public int level;
	public int battle;

	public Mon(int l) {
		level = l;
		battle = 0;
	}
}