/* -*- coding: utf-8 -*-
 *
 * 9.cc: No.9 モンスターのレベル上げ - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 1500;
const int INF = 1 << 30;

/* typedef */

typedef pair<int,int> pii;
typedef multiset<pii> mspii;

/* global variables */

int as[MAX_N], bs[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  cin >> n;

  for (int i = 0; i < n; i++) cin >> as[i];
  for (int i = 0; i < n; i++) (cin >> bs[i]), bs[i] /= 2;

  mspii aset0;
  for (int i = 0; i < n; i++) aset0.insert(pii(as[i], 0));

  int mind = INF;

  for (int i = 0; i < n; i++) {
    mspii aset(aset0);
    int maxd = 0;

    for (int j = 0; j < n; j++) {
      mspii::iterator sit = aset.begin();
      pii a(*sit);
      a.first += bs[(i + j) % n];
      a.second++;
      aset.erase(sit);
      aset.insert(a);
      if (maxd < a.second) maxd = a.second;
    }

    if (mind > maxd) mind = maxd;
  }

  printf("%d\n", mind);
  return 0;
}