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//#pragma optimization_level 3

//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#include <chrono>
#include <ctime>
#include <queue>
#include <math.h>
#include <deque>
#include <stack>
#include <iomanip>
#include <assert.h>
#include <stdio.h>
#include <cstring>
#include <random>

using namespace std;

#define int long long
#define ll long long
#define ull unsigned long long
#define ld long double
#define pii pair<int, int>
#define pld pair<ld, ld>
#define vi vector <int>
#define vpi vector <pii>
#define vld vector <ld>
#define try tr
#define left left11
#define right right11
#define lb lower_bound
#define ub upper_bound
#define sz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define pf push_front
#define sqr(a) ((a) * (a))
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

#define x first
#define y second

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

clock_t START;

inline ld TIME() {
    return (ld) (clock() - START) / CLOCKS_PER_SEC;
}

ld TL = 2.0; 
int calls = 0;

inline bool IS() {
    if(++calls == 1000) {
        calls = 0;
        if(TL - TIME() < 0.1)
            return true;
    }
    return false;
}

template<typename T1, typename T2>
inline void amin(T1 &a, T2 b) { if (a > b) a = b; }

template<typename T1, typename T2>
inline void amax(T1 &a, T2 b) { if (a < b) a = b; }

template<typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> &p) {
    os << p.first << ' ' << p.second << endl;
    return os;
}

template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
    is >> p.first >> p.second;
    return is;
}

template<typename T>
istream &operator>>(istream &is, vector<T> &v) {
    for (auto &u : v) is >> u;
    return is;
}

template<typename T>
ostream &operator<<(ostream &os, vector<T> &v) {
    for (auto &u : v) os << u << ' ';
    os << endl;
    return os;
}

int hash_mod[4] = {1000000007, 998244353, 1000000009, 999999937}, mod = hash_mod[rnd() % 4];
int hash_pows[4] = {179, 239, 1007, 2003}, P = hash_pows[rnd() % 4];

int binpow(int x, int p) {
    int res = 1;
    while(p) {
        if(p % 2)
            res = (res * x) % mod;
        x = (x * x) % mod;
        p /= 2;
    }
    return res;
}

const int N = 1e6 + 7, NS = 3e3 + 7, lg = 20, sq = 550, inf = 2e9 + 7, SM = 1e2 + 7;
const ld eps = 1e-9;
struct tree{
	vi t;
	int n;
	void init(int _n) {
		n = _n;
		t.resize(4 * n);
	}
	void update(int v, int l, int r, int pos, int val) {
		if(l == r - 1)
			t[v] = val;
		else {
			int m = (l + r) / 2;
			if(pos < m)
				update(2 * v, l, m, pos, val);
			else
				update(2 * v + 1, m, r, pos, val);
			t[v] = max(t[2 * v], t[2 * v + 1]);
		}
	}
	void update(int pos, int val) {
		update(1, 0, n, pos, val);
	}
	int get(int v, int l, int r, int vl, int vr) {
		if(l >= vr || vl >= r)
			return 0;
		if(l >= vl && r <= vr)
			return t[v];
		int m = (l + r) / 2;
		return max(get(2 * v, l, m, vl, vr), get(2 * v + 1, m, r, vl, vr));
	}
	int get(int vl, int vr) {
		return get(1, 0, n, vl, vr);
	}
} T;
int d[N];
void solve() {
	int n;
	cin >> n;
	vi a(n), b(n);
	cin >> a;
	cin >> b;
	T.init(n);
	for (int i = 0; i < n; i++) {
		a[i]--;
		int mx = T.get(0, a[i]);
		T.update(a[i], mx + b[i]);
	}
	cout << T.get(0, n);
}

signed main() {
    fast
    solve();
}

Measured memory_bytes: 12704