#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main() {
    int N;
    cin >> N;
    vector<int> A(N, 0), B(N, 0);
    for (int i = 0; i < N; ++i) {
        cin >> A[i];
    }
    for (int i = 0; i < N; ++i) {
        cin >> B[i];
    }

    typedef pair<pair<int, int>, int> level_nb_id;
    int ans = N;
    for (int i = 0; i < N; ++i) {
        priority_queue<level_nb_id, vector<level_nb_id>, greater<level_nb_id>> q;
        for (int j = 0; j < N; ++j) {
            q.push(make_pair(make_pair(A[j], 0), j));
        }
        for (int j = 0; j < N; ++j) {
            level_nb_id curr = q.top();
            q.pop();
            curr.first.first += B[(i + j) % N] / 2;
            curr.first.second += 1;
            q.push(curr);
        }
        int temp = 0;
        for (int j = 0; j < N; ++j) {
            temp = max(temp, q.top().first.second);
            q.pop();
        }
        ans = min(ans, temp);
    }
    cout << ans << endl;
}

int main() {
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}