# include <iostream>
# include <algorithm>
#include <array>
# include <cassert>
#include <cctype>
#include <climits>
#include <numeric>
# include <vector>
# include <string>
# include <set>
# include <map>
# include <cmath>
# include <iomanip>
# include <functional>
# include <tuple>
# include <utility>
# include <stack>
# include <queue>
# include <list>
# include <bitset>
# include <complex>
# include <chrono>
# include <random>
# include <limits.h>
# include <unordered_map>
# include <unordered_set>
# include <deque>
# include <cstdio>
# include <cstring>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
constexpr long long MOD = 1000000000 + 7;
constexpr long long INF = std::numeric_limits<long long>::max();
const double PI = acos(-1);
#define fir first
#define sec second
typedef pair<LL, LL> Pll;
typedef pair<LL, pair<LL, LL>> Ppll;
typedef pair<LL, pair<LL, bitset<100001>>> Pbll;
typedef pair<LL, pair<LL, vector<LL>>> Pvll;
typedef pair<LL, LL> Vec2;
struct Tll { LL first, second, third; };
typedef pair<LL, Tll> Ptll;
#define rep(i,rept) for(LL i=0;i<rept;i++)
#define Mfor(i,mf) for(LL i=mf-1;i>=0;i--)
LL h, w, n, m, k, s, t, q, sum, last, ans = INF, a[1600], b[1600];
struct Edge { LL to, cost; };
string str;
bool f[1600];
void YN(bool f) {
	if (f)
		cout << "YES" << endl;
	else
		cout << "NO" << endl;
}
void yn(bool f) {
	if (f)
		cout << "Yes" << endl;
	else
		cout << "No" << endl;
}
vector<Edge>vec[100000];
int main() {
	cin >> n;
	rep(i, n)cin >> a[i];
	rep(i, n)cin >> b[i];
	rep(i, n) {
		LL cnt[1600] = {}, mx = 0;
		priority_queue <Ppll, vector<Ppll>, greater<Ppll>>q;
		rep(j, n)q.push(Ppll(a[j], Pll(0, j)));
		rep(j, n) {
			Ppll p = q.top();
			q.pop();
			cnt[p.sec.sec]++;
			mx = max(mx, cnt[p.sec.sec]);
			q.push(Ppll(p.fir + b[(j + i) % n] / 2, Pll(cnt[p.sec.sec], p.sec.sec)));
		}
		ans = min(ans, mx);
	}
	cout << ans << endl;
	return 0;
}