import java.io.*;
import java.util.*;
import java.math.*;

class Main {
	
	static int len;
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static int[] sort (int[] a) {
		for (int i = 1; i < len; i++) {
			if (a[0] > a[i]) {
				int tmp = a[0];
				a[0] = a[i];
				a[i] = tmp;
			}
		}
		return a;
	}
	
	public static int solve (int[] levelM , int[] levelE) {
		int ret = Integer.MAX_VALUE , maxI = -1;
		int[] bk = Arrays.copyOf(levelM , len);
		main:for (int i = 0; i < len; i++) {
			int win = 0;
			PriorityQueue<Integer> pq = new PriorityQueue<Integer>();
			for (int j = 0; j < len; j++) pq.add(bk[j]);
			for (int j = i; win++ < len; j++) {
				j %= len;
				int p = pq.poll();
				p += levelE[j] + 1;
				if ((p & 0xfff) >= ret) continue main;
				pq.add(p);
			}
			int max = 0;
			for (int j = 0; j < len; j++)
				max = Math.max(max , pq.poll() & 0xfff);
			ret = Math.min(ret , max);
		}
		return ret;
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		len = Integer.parseInt(br.readLine());
		String[] line1 = br.readLine().split(" ");
		int[] levelM = new int[len];
		String[] line2 = br.readLine().split(" ");
		int[] levelE = new int[len];
		
		for (int i = 0; i < len; i++) {
			levelM[i] = Integer.parseInt(line1[i]) << 12;
			levelE[i] = (Integer.parseInt(line2[i]) >> 1) << 12;
		}
		
		out(solve(levelM , levelE));
	}
}