#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

#define INF 1000000000

using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const int MAXN = 2000;
int A[MAXN], B[MAXN];

int main(void) {
    int N;
    cin >> N;
    for (int i = 0; i < N; i++) cin >> A[i];
    for (int i = 0; i < N; i++) cin >> B[i];
    int ans = INF;
    for (int i = 0; i < N; i++) {
        priority_queue<P, vector<P>, greater<P> > que;
        for (int j = 0; j < N; j++) {
            que.push(P(A[j], 0));
        }
        int cnt = 0;
        int cur = i;
        while (cnt < N) {
            P p = que.top(); que.pop();
            p.second++;
            p.first += B[cur] / 2;
            cur = (cur+1) % N;
            cnt++;
            que.push(p);
        }
        int maxNum = 0;
        while (!que.empty()) {
            P p = que.top(); que.pop();
            maxNum = max(maxNum, p.second);
        }
        ans = min(ans, maxNum);
    }
    cout << ans << endl;
    return 0;
}