#include <bits/stdc++.h>

using namespace std;

#define REP(i, n)   for(int i = 0; i < (n); i++)
#define REPS(i, n)  for(int i = 1; i <= (n); i++)
#define RREP(i, n)  for(int i = (n)-1; i >= 0; i--)
#define RREPS(i, n) for(int i = (n); i > 0; i--)
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
#define UNIQUE(v) v.erase(unique(v.begin(), v.end()), v.end())
#define mp make_pair
#define mt make_tuple
#define pb push_back

using ll  = long long;
using pi  = pair<int, int>;
using pl  = pair<ll, ll>;
using vi  = vector<int>;
using vl  = vector<ll>;
using vs  = vector<string>;
using vvi = vector<vi>;

const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;

template<class T> bool chmax(T &a, const T &b) { if(a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if(a > b) { a = b; return true; } return false; }

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);

    int N; cin >> N;
    vi A(N), B(N); 
    REP(i, N) cin >> A[i];
    REP(i, N) cin >> B[i];
    int ans = INF;
    REP(i, N)
    {
        priority_queue<pi, vector<pi>, greater<pi>> q;
        REP(j, N) q.push(mp(A[j], 0));
        REP(j, N)
        {
            pi p = q.top(); q.pop();
            p.first += B[(i+j)%N] / 2;
            p.second++;
            q.push(p);
        }

        int tmp = 0;
        while(!q.empty())
        {
            pi p = q.top(); q.pop();
            chmax(tmp, p.second);
        }
        chmin(ans, tmp);
    }
    cout << ans << endl;
}