import java.io.IOException;
import java.util.InputMismatchException;
import java.util.PriorityQueue;

public class Main {
	class D implements Comparable<D> {
		int level;
		int battle;

		D(int level, int battle) {
			this.level = level;
			this.battle = battle;
		}

		@Override
		public int compareTo(D o) {
			return this.level != o.level ? this.level - o.level : this.battle - o.battle;
		}
	}

	void run() {
		MyScanner sc = new MyScanner();

		int n = sc.nextInt();

		int[] a = sc.nextIntArray(n);
		int[] b = sc.nextIntArray(n);

		int min = 1 << 25;
		for (int i = 0; i < n; i++) {
			PriorityQueue<D> pq = new PriorityQueue<D>();
			for (int j = 0; j < n; j++) {
				pq.add(new D(a[j], 0));
			}
			for (int j = 0; j < n; j++) {
				int ene = (i + j) % n;
				D d = pq.poll();
				d.level += b[ene] / 2;
				d.battle++;
				pq.add(d);
			}
			int max = 0;
			for (D d : pq) {
				max = Math.max(max, d.battle);
			}
			min = Math.min(min, max);
		}

		System.out.println(min);
	}

	public static void main(String[] args) {
		new Main().run();
	}

	public void mapDebug(int[][] a) {
		System.out.println("--------map display---------");
		for (int i = 0; i < a.length; i++) {
			for (int j = 0; j < a[i].length; j++) {
				System.out.printf("%3d ", a[i][j]);
			}
			System.out.println();
		}
		System.out.println("----------------------------" + '\n');
	}

	class MyScanner {
		int read() {
			try {
				return System.in.read();
			} catch (IOException e) {
				throw new InputMismatchException();
			}
		}

		boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		boolean isEndline(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		int[] nextIntArray(int n) {
			int[] array = new int[n];
			for (int i = 0; i < n; i++)
				array[i] = nextInt();
			return array;
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		long[] nextLongArray(int n) {
			long[] array = new long[n];
			for (int i = 0; i < n; i++)
				array[i] = nextLong();
			return array;
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		double[] nextDoubleArray(int n) {
			double[] array = new double[n];
			for (int i = 0; i < n; i++)
				array[i] = nextDouble();
			return array;
		}

		String next() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		String[] nextStringArray(int n) {
			String[] array = new String[n];
			for (int i = 0; i < n; i++)
				array[i] = next();

			return array;
		}

		String nextLine() {
			int c = read();
			while (isEndline(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndline(c));
			return res.toString();
		}
	}
}