import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int[] levels = new int[n];
        for (int i = 0; i < n; i++) {
            levels[i] = sc.nextInt();
        }
        int[] enemies = new int[n];
        for (int i = 0; i < n; i++) {
            enemies[i] = sc.nextInt() / 2;
        }
        PriorityQueue<Monster> side = new PriorityQueue<>();
        int ans = Integer.MAX_VALUE;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                side.add(new Monster(levels[j]));
            }
            for (int j = 0; j < n; j++) {
                Monster x = side.poll();
                x.add(enemies[(i + j) % n]);
                side.add(x);
            }
            int max = 0;
            while (side.size() > 0) {
                max = Math.max(max, side.poll().count);
            }
            ans = Math.min(ans, max);
        }
        System.out.println(ans);
    }
    
    static class Monster implements Comparable<Monster> {
        int value;
        int count;
        
        public Monster(int value) {
            this.value = value;
        }
        
        public void add(int x) {
            value += x;
            count++;
        }
        
        public int compareTo(Monster another) {
            if (value == another.value) {
                return count - another.count;
            } else {
                return value - another.value;
            }
        }
    }
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}