#include <stdio.h>
#include <iostream>
#include <vector>
#include <array>
#include <algorithm>
using namespace std;
typedef long long ll;
int main()
{
	cin.tie(0), cin.sync_with_stdio(0);
	int n;
	cin >> n;
	vector<array<int, 2>> v(n);
	for (int i = 0; i < n; i++)
	{
		cin >> v[i][0];
	}
	for (int i = 0; i < n; i++)
	{
		cin >> v[i][1];
	}
	sort(v.begin(), v.end());
	int l = 0, r = n - 1;
	ll xp = 0;
	ll time = 0;
	while (l <= r) {
		if (v[l][0] <= xp) {
			time += v[l][1];
			xp += v[l][1];
			v[l][1] = 0;
			l++;
		}
		else {
			time += 2;
			xp++;
			v[r][1]--;
			if (v[r][1] == 0)
				r--;
		}
	}
	cout << time;
}