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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<int> A(N),B(N);
    for(auto &a : A) cin >> a;
    for(auto &b : B) cin >> b;
    for(int i=0; i<N; i++) B.push_back(B.at(i));

    int answer = 0;
    for(int i=0; i<N; i++){
        priority_queue<pair<int,int>,vector<pair<int,int>>,greater<>> Q;
        for(int k=0; k<N; k++) Q.push({A.at(k),0});
        for(int k=i; k<i+N; k++){
            auto[level,fight] = Q.top(); Q.pop();
            level += B.at(k)/2; fight++;
            answer = max(fight,answer); 
            Q.push({level,fight});  
        }
    }
    cout << answer << endl;
}