#ifndef __SEGMENT_TREE_H__
#define __SEGMENT_TREE_H__

#include <vector>
#include <functional>
#include <algorithm>
#include <limits>
#include <cassert>
#include <iostream>
#include <string>
#include <sstream>

/*-- てんぷれ --*/
struct HogeMonoid {
	using Type = int;
	static Type Identity() {
		return Type();
	}
	static Type Operate(const Type& left, const Type& right) {
		return Type();
	}
};

/*--------------*/

namespace Monoid {
	template <class T>
	struct Sum {
		using Type = T;
		static Type Identity() {
			return T();
		}
		static Type Operate(const Type& left, const Type& right) {
			return left + right;
		}
	};

	template <class T>
	struct Minimum {
		using Type = T;
		static Type Identity() {
			return std::numeric_limits<Type>::max();
		}
		static Type Operate(const Type& left, const Type& right) {
			return std::min(left, right);
		}
	};

	template <class T>
	struct Maximum {
		using Type = T;
		static Type Identity() {
			return std::numeric_limits<Type>::min();
		}
		static Type Operate(const Type& left, const Type& right) {
			return std::max(left, right);
		}
	};
}

/* 注意: コンストラクタの引数は size でない */
template <class Monoid>
class SegmentTree {
	using T = typename Monoid::Type;

	const int level_m;		// 段数 - 1
	const size_t size_m;	// 1 << level_m
	std::vector<T> arr_m;

	static T Identity();
	static T Operate(const T& left, const T& right);
	bool Is_valid_index(size_t pos) const;
	
	static const int DEFAULT = -1;
public:
	SegmentTree(int level);

	void Update(size_t pos, const T& value);
	T Query(size_t left, size_t right) const;
	T Get(size_t pos) const;
	void Debug(int level = DEFAULT, int cell_width = 4) const;
};

template<class Monoid>
typename SegmentTree<Monoid>::T SegmentTree<Monoid>::Identity() {
	return Monoid::Identity();
}

template<class Monoid>
typename SegmentTree<Monoid>::T SegmentTree<Monoid>::Operate(const T& left, const T& right) {
	return Monoid::Operate(left, right);
}

template<class Monoid>
inline bool SegmentTree<Monoid>::Is_valid_index(size_t pos) const {
	return pos >= 0 && pos < size_m;
}

/* 1 << level 要素の segment tree を作成 */
template<class Monoid>
SegmentTree<Monoid>::SegmentTree(int level)
	: level_m(level), size_m(1 << level) {
	assert(level < 32);
	if (0) {
		assert(0); // 引数が level になっていることを確認してから submit
	}
	arr_m.resize(size_m * 2, Identity());
}

/* pos 番目の要素を value に書き換える */
template<class Monoid>
void SegmentTree<Monoid>::Update(size_t pos, const T& value) {
	pos += size_m;
	arr_m[pos] = value;
	pos >>= 1;
	while (pos > 0) {
		arr_m[pos] = Operate(arr_m[pos * 2], arr_m[pos * 2 + 1]);
		pos >>= 1;
	}
}

/* [left, right) に存在する全要素の(指定した演算に関する)積をとる */
template<class Monoid>
typename SegmentTree<Monoid>::T SegmentTree<Monoid>::Query(size_t left, size_t right) const {
	assert(left <= right);

	T tmp_left = Identity();
	T tmp_right = Identity();
	left += size_m;
	right += size_m;
	while (left < right) {
		if (left & 1) tmp_left = Operate(tmp_left, arr_m[left++]);
		if (right & 1) tmp_right = Operate(arr_m[--right], tmp_right);
		left >>= 1;
		right >>= 1;
	}

	return Operate(tmp_left, tmp_right);
}

/* pos 番目の要素を直接取得 */
template<class Monoid>
typename SegmentTree<Monoid>::T SegmentTree<Monoid>::Get(size_t pos) const {
	return arr_m[size_m + pos];
}

/* デバッグ出力用; level = -1 とすると全要素出力 */
template<class Monoid>
void SegmentTree<Monoid>::Debug(int level, int cell_width) const {
	/* 値 value を幅 max_length になるように成形して文字列化 */
	auto to_str_fixed = [](const T& value, int max_length) -> std::string {
		std::ostringstream osst;
		osst << value;

		std::string str = osst.str();
		std::string output;
		if (str.size() > max_length) {
			for (int i = 0; i < max_length; ++i) {
				output += '#';
			}
		} else {
			const int remain_length = max_length - str.size();
			const int right_blank = remain_length / 2;
			const int left_blank = remain_length - right_blank;
			for (int i = 0; i < left_blank; ++i) {
				output += ' ';
			}
			output += str;
			for (int i = 0; i < right_blank; ++i) {
				output += ' ';
			}
		}
		return output;
	};

	if (level == DEFAULT) {			// デフォルト値への対処
		level = level_m;
	}

	if (level > level_m) {
		level = level_m;
	}

	std::vector<std::string> output_strs;

	for (int lev = 0; lev <= level; ++lev) {
		std::string output;
		const int front = size_m >> lev;

		output += '|';
		for (int i = 0; i < (1 << (level - lev)); ++i) {
			output += to_str_fixed(arr_m[front + i], cell_width);
			output += '|';
		}
		output_strs.push_back(output);

		cell_width = cell_width * 2 + 1;
	}

	reverse(output_strs.begin(), output_strs.end());
	for (const std::string& output : output_strs) {
		std::cout << output << std::endl;
	}
}

#endif

#define _CRT_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <iostream>
#include <string>
#include <vector>
#include <list>
#include <utility>
#include <algorithm>
#include <functional>
#include <cmath>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <iomanip>
#include <sstream>
#include <bitset>
#include <limits>
#include <numeric>
#include <valarray>
#include <fstream>

using namespace std;
typedef unsigned int uint;
typedef long long LL;
typedef unsigned long long ULL;
typedef pair<LL, LL> PP;
#define REP(i, a, n) for(LL i = (a), i##_max = (n); i < i##_max; ++i)
#define REM(i, a, n) for(LL i = (LL)(n) - 1, i##min = (a); i >= i##min; --i)
#define ALL(arr) (arr).begin(), (arr).end()
#define FLOAT fixed << setprecision(16)
#define SPEEDUP {cin.tie(NULL); ios::sync_with_stdio(false);}
const int INF = 0x3FFFFFFF;
const LL INFLL = 0x3FFFFFFF3FFFFFFF;
const double INFD = 1.0e+308;
const string INFSTR = "\x7f";
const double EPS = 1.0e-9;

void YesNo(bool b) { cout << (b ? "Yes" : "No") << endl; }
void YESNO(bool b) { cout << (b ? "YES" : "NO") << endl; }
template <class T, class U>
istream& operator>>(istream& ist, pair<T, U>& right) { return ist >> right.first >> right.second; }
template <class T, class U>
ostream& operator<<(ostream& ost, const pair<T, U>& right) { return ost << right.first << ' ' << right.second; }
template <class T, class TCompatible, size_t N>
void Fill(T(&dest)[N], const TCompatible& val) { fill(dest, dest + N, val); }
template <class T, class TCompatible, size_t M, size_t N>
void Fill(T(&dest)[M][N], const TCompatible& val) { for (int i = 0; i < M; ++i) Fill(dest[i], val); }
template<class T>
T Compare(T left, T right) { return left > right ? 1 : (left < right ? -1 : 0); }
istream& Ignore(istream& ist) { string s; ist >> s; return ist; }
bool Inside(int i, int j, int h, int w) { return i >= 0 && i < h && j >= 0 && j < w; }
template <class T>
T Next() { T buf; cin >> buf; return buf; }

#ifdef ONLY_MY_ENVIR
#include "IntMod.h"
#include "UnionFind.h"
#include "Graph.h"
#include "Range.h"
#include "Global.h"
#include "FlowSolver.h"
#include "Tree.h"
#include "SuffixArray.h"
#include "Geometry.h"
#include "Matrix.h"
#include "SegmentTree.h"
#include "SegmentTree2D.h"
#include "BIT.h"
#include "Rational.h"
#include "Position.h"
#include "Factorization.h"
#include "Math.h"
#endif

#ifdef __GNUC__
typedef __int128 LLL;
istream& operator>> (istream& ist, __int128& val) { LL tmp;  ist >> tmp; val = tmp; return ist; }
ostream& operator<< (ostream& ost, __int128 val) { LL tmp = val; ost << tmp; return ost; }
#endif

#if 1234567891
#include <array>
#include <random>
#include <unordered_set>
#include <unordered_map>
template<typename T>
using PriorityQ = priority_queue<T, vector<T>, greater<T> >;
// template <class T>
// auto Is(const T& value) { return [value](const auto& comparand) -> bool { return comparand == value; }; }
#endif

int N;
int A[200000];
LL C[200000];

LL DP[200001];
int main() {
	cin >> N;
	REP(i, 0, N) {
		cin >> A[i];
	}
	REP(i, 0, N) {
		cin >> C[i];
	}

	vector<PP> v;
	REP(i, 0, N) {
		v.push_back(PP(A[i], i));
	}
	sort(v.begin(), v.end());

	SegmentTree<Monoid::Maximum<LL>> seg(18);
	for (PP p : v) {
		int i = p.second;

		LL mx = max(0LL, seg.Query(0, i));
		seg.Update(i, mx + C[i]);
	}

	cout << seg.Query(0, N) << endl;
	return 0;
}


Measured memory_bytes: 10860