#include<iostream>
#include<vector>
#include<cmath>
#include<climits>
#include<algorithm>
#include<queue>
#include<tuple>

using namespace std;  
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define rep(i,n) for(ll i=0;i<(n);i++)  
#define pii pair<int,int>
#define piii pair<int,pii>
#define mp make_pair
#define pb push_back  
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second  
const int INF = (INT_MAX/2);
const ll LLINF = (LLONG_MAX/2);
const double eps = 1e-5;
const double PI = M_PI;
#define DEB cerr<<"!"<<endl
#define SHOW(a,b) cerr<<(a)<<" "<<(b)<<endl
#define SHOWARRAY(ar,i,j) REP(a,i)REP(b,j)cerr<<ar[a][b]<<((b==j-1)?((a==i-1)?("\n\n"):("\n")):(" "))

int main(){
  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(index,n){
    priority_queue<int,vi,greater<int>> q;
    rep(i,n) q.push(a[i] * 2000);
    int i = index; bool ii = 1;
    while(ii){
      int s = q.top(); q.pop();
      s += (b[i]/2)*2000 + 1;
      q.push(s);
      SHOW(index,i);
      i++;
      if(i == n) i=0;
      if(i==index) ii = 0;
    }
    int ta = 0;
    while(!q.empty()){
      ta = max(ta,q.top() % 2000);
      q.pop();
    }
    ans = min(ta,ans);
  }
  cout << ans << endl;
  return 0;
}