#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

static const double EPS = 1e-8;
static const double PI = 4.0 * atan(1.0);
static const double PI2 = 8.0 * atan(1.0);

#define REP(i,n)	for(int i=0;i<(int)n;++i)
#define ALL(c)		(c).begin(),(c).end()
#define CLEAR(v)	memset(v,0,sizeof(v))
#define MP(a,b)		make_pair((a),(b))
#define ABS(a)		((a)>0?(a):-(a))
#define FOR(i,s,n)	for(int i=s;i<(int)n;++i)

int N;
int A[10000], B[10000];

int main(int argc, char **argv) {
	cin >> N;
	REP(i, N) cin >> A[i];
	REP(i, N) cin >> B[i];
	int res = N;
	REP(s, N) {
		map<pair<pair<int, int>, int>, int> lv;
		REP(i, N) lv[MP(MP(A[i], 0), i)] = 0;
		REP(i, N) {
			auto k = lv.begin()->first;
			auto kf = k.first;
			auto v = lv.begin()->second;
			lv[MP(MP(kf.first + B[(s + i) % N] / 2, kf.second + 1), k.second)] = 0;
			lv.erase(lv.begin());
		}
		int m = 0;
		for (auto it = lv.begin(); it != lv.end(); ++it) {
			m = max(m, (*it).first.first.second);
		}
		res = min(res, m);
	}
	cout << res << endl;
	return 0;
}