#include <bits/stdc++.h>

using namespace std;

using ll = long long;

struct Mo {
    const int width;
    vector<int> ls, rs, ord;
    Mo(int n) : width((int)sqrt(n)) {}

    inline void insert(int l, int r) {
        ls.emplace_back(l);
        rs.emplace_back(r);
    }

    inline void build() {
        ord.resize(ls.size());
        iota(ord.begin(), ord.end(), 0);
        sort(ord.begin(), ord.end(), [&](const int a, const int b) {
            int ablock = ls[a] / width, bblock = ls[b] / width;
            if (ablock != bblock) return ablock < bblock;
            return ablock & 1 ? rs[a] < rs[b] : rs[a] > rs[b];
        });
    }

    // void add(int idx): idx番目の要素を追加
    // void del(int idx): idx番目の要素を削除
    // void calc(int idx); クエリidxを処理
    template<class Add, class Del, class Calc>
    inline void run(const Add& add, const Del& del, const Calc& calc) {
        int nl = 0, nr = 0;
        for (const int idx : ord) {
            while (nl > ls[idx]) add(--nl);
            while (nr < rs[idx]) add(nr++);
            while (nl < ls[idx]) del(nl++);
            while (nr > rs[idx]) del(--nr);
            calc(idx);
        }
    }
};

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<ll> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    Mo mo(n);
    vector< vector<int> > query_id(n + 1);
    int query_num = 0;
    for (int k = 1; k <= n; k++) {
        int max_num = n / k;
        for (int i = 0; i < max_num; i++) {
            query_id[k].push_back(query_num);
            mo.insert(i * k, (i + 1) * k);
            query_num++;
        }

        for (int i = 0; i < max_num; i++) {
            query_id[k].push_back(query_num);
            mo.insert(n - (i + 1) * k, n - i * k);
            query_num++;
        }
    }
    mo.build();

    multiset<ll> sl, sr;
    auto add = [&](int idx) {
        if (sr.size() > sl.size()) {
            sr.insert(a[idx]);
        } else {
            sl.insert(a[idx]);
        }

        if (sl.size() > sr.size()) {
            ll tmp = *sl.rbegin();
            sl.erase(sl.find(tmp));
            sr.insert(tmp);
        } else if (sr.size() > sl.size() + 1) {
            ll tmp = *sr.begin();
            sr.erase(sr.begin());
            sl.insert(tmp);
        }
    };

    auto del = [&](int idx) {
        assert(!sr.empty());

        if (a[idx] >= *sr.begin()) {
            sr.erase(sr.find(a[idx]));
        } else {
            sl.erase(sl.find(a[idx]));
        }

        if (sl.size() > sr.size()) {
            ll tmp = *sl.rbegin();
            sl.erase(sl.find(tmp));
            sr.insert(tmp);
        } else if (sr.size() > sl.size() + 1) {
            ll tmp = *sr.begin();
            sr.erase(sr.begin());
            sl.insert(tmp);
        }
    };

    vector<ll> med(query_num);
    auto calc = [&](int idx) {
        med[idx] = (sr.size() == sl.size() ? *sl.rbegin() : *sr.begin());
    };

    mo.run(add, del, calc);

    ll ans = 0;
    for (int k = 1; k <= n; k++) {
        int max_num = n / k;
        vector<ll> memoL(max_num + 1, 0);
        ll tmp = 0;
        for (int i = 0; i < max_num; i++) {
            tmp += med[query_id[k][i]] * k;
            memoL[i + 1] = max(memoL[i], tmp);
        }

        vector<ll> memoR(max_num + 1, 0);

        tmp = 0;
        for (int i = 0; i < max_num; i++) {
            tmp += med[query_id[k][i + max_num]] * k;
            memoR[i + 1] = max(memoR[i], tmp);
        }

        for (int i = 0; i <= max_num; i++) {
            ans = max(ans, memoL[i] + memoR[max_num - i]);
        }
    }
    cout << ans << "\n";
    return 0;
}