#include <bits/stdc++.h>

using namespace std;

int main() {
  int n;
  cin >> n;
  set<tuple<int, int>> s;
  for (int i = 0; i < n; ++i) {
    int a;
    cin >> a;
    s.insert(make_tuple(a, 0));
  }
  for (int i = 0; i < n; ++i) {
    int b;
    cin >> b;
    auto p = *s.begin();
    s.erase(s.begin());
    s.insert(make_tuple(get<0>(p) + b / 2, get<1>(p) + 1));
  }
  int res = 0;
  for (auto p : s) res = max(res, get<1>(p));
  cout << res << endl;
}