// UUID: 7549ce61-2e4e-4b35-ad24-726909d5e4b4
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define pii pair<int, int>
#define pb push_back
#define srt(x) x.begin(),x.end()
const int INF = 1e9 + 7;

signed main() {
    ios::sync_with_stdio(false);cin.tie(nullptr);
	int n; cin >> n;
	vector<pii>a(n);
	for(int i = 0; i < n; i++) cin >> a[i].F;
	for(int i = 0; i < n; i++) cin >> a[i].S;
	sort(srt(a));
	int lvl = 0, ans = 0;
	int l = 0, r = n-1;
	while(l <= r)
	{
		if(a[l].F <= lvl)
		{
			lvl += a[l].S;
			ans += a[l].S;
			l++;
		}
		else
		{
			lvl++;
			ans += 2;
			a[r].S--;
			if(a[r].S == 0) r--;
		}
	}
	cout << ans;
}