#include <bits/stdc++.h>
using namespace std;

#define rep(i, j, n) for(int i=j;i<n;++i)
#define all(i) i.begin(),i.end()
#define rall(i) i.rbegin(),i.rend()
#define INF 1e9
#define Puts(x) puts(x? "Yes":"No")
const int mod = 1e9 + 7;

typedef long long i64;
typedef pair<int, int> pi;

template <class T> using vt = vector<T>;
template <class T> using vvt = vector<vector<T>>;

i64 gcd(int n, int m) {return (m == 0? n : gcd(m, n % m));}
i64 lcm(int n, int m) {return (n / gcd(n, m) * m);}
int dx[] = {0, 1, 0, -1, 1, 1, -1, -1};
int dy[] = {1, 0, -1, 0, 1, -1, 1, -1};

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  int n;
  cin >> n;
  vt<int> a(n), b(n);
  rep(i, 0, n) cin >> a[i];
  rep(i, 0, n) cin >> b[i];

  int ans = INF;
  rep(i, 0, n) {
    priority_queue<pi, vt<pi>, greater<pi>> que;
    rep(j, 0, n) que.push({a[j], 0});

    rep(j, i, n) {
      pi p = que.top();
      que.pop();

      p.first += b[j] / 2;
      p.second++;
      que.push(p);
    }
    rep(j, 0, i) {
      pi p = que.top();
      que.pop();

      p.first += b[j] / 2;
      p.second++;
      que.push(p);
    }

    int num = 0;
    while(!que.empty()) {
      num = max(num, que.top().second);
      que.pop();
    }
    ans = min(ans, num);
  }
  cout << ans << endl;
}