//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

class SegmentTree {

    int n;
    vector<LL> node;

public:

    SegmentTree(vector<LL> a) {
        int sz = a.size();
        n = 1;
        while (n < sz) n *= 2;
        node.resize(2 * n - 1, 0);
        for (int i = 0; i < sz; i++) node[i + n - 1] = a[i];
        for (int i = n - 2; i >= 0; i--) node[i] = max(node[i * 2 + 1], node[i * 2 + 2]);
    }

    void update(int index, LL x) {
        index += (n - 1);
        node[index] = x;
        while (index > 0) {
            index = (index - 1) / 2;
            node[index] = max(node[index * 2 + 1], node[index * 2 + 2]);
        }
    }

    LL getMax(int a, int b, int k = 0, int l = 0, int r = -1) {
        if (r < 0) r = n;
        if (r <= a || b <= l) return 0;
        if (a <= l && r <= b) return node[k];
        LL vl = getMax(a, b, k * 2 + 1, l, (l + r) / 2);
        LL vr = getMax(a, b, k * 2 + 2, (l + r) / 2, r);
        return max(vl, vr);
    }

};

constexpr LL INF = 1e16;

int main() {

    int N;
    cin >> N;

    vector<LL> h(N), a(N);
    for (int i = 0; i < N; i++) cin >> h[i];
    for (int i = 0; i < N; i++) cin >> a[i];

//    vector<pair<LL, LL>> ha(N);
//    for (int i = 0; i < N; i++) ha[i] = make_pair(h[i], a[i]);
//    sort(ha.begin(), ha.end());

    vector<pair<LL, pair<LL, LL>>> hai(N);
    for (int i = 0; i < N; i++) hai[i] = make_pair(h[i], make_pair(a[i], i));
    sort(hai.begin(), hai.end());

    SegmentTree tree(vector<LL>(N, 0));
    for (int i = 0; i < N; i++) {
        int height = hai[i].first;
        LL val = hai[i].second.first;
        int index = hai[i].second.second;

        LL maxV = tree.getMax(0, index);
        tree.update(index, maxV + val);
    }

    LL ans = tree.getMax(0, N);
    cout << ans << endl;

    return 0;
}
















































Measured memory_bytes: 13696