#include <bits/stdc++.h>
#pragma GCC diagnostic ignored "-Wsign-compare"
#pragma GCC diagnostic ignored "-Wsign-conversion"

using i32 = int32_t;
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;
using uint = unsigned int;
using usize = std::size_t;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
template<typename T> constexpr T popcount(const T u) { return u ? static_cast<T>(__builtin_popcountll(static_cast<u64>(u))) : static_cast<T>(0); }
template<typename T> constexpr T log2p1(const T u) { return u ? static_cast<T>(64 - __builtin_clzll(static_cast<u64>(u))) : static_cast<T>(0); }
template<typename T> constexpr T msbp1(const T u) { return log2p1(u); }
template<typename T> constexpr T lsbp1(const T u) { return __builtin_ffsll(u); }
template<typename T> constexpr T clog(const T u) { return u ? log2p1(u - 1) : static_cast<T>(u); }
template<typename T> constexpr bool ispow2(const T u) { return u and (static_cast<u64>(u) & static_cast<u64>(u - 1)) == 0; }
template<typename T> constexpr T ceil2(const T u) { return static_cast<T>(1) << clog(u); }
template<typename T> constexpr T floor2(const T u) { return u == 0 ? static_cast<T>(0) : static_cast<T>(1) << (log2p1(u) - 1); }
template<typename T> constexpr bool btest(const T mask, const usize ind) { return static_cast<bool>((static_cast<u64>(mask) >> ind) & static_cast<u64>(1)); }
template<typename T> void bset(T& mask, const usize ind) { mask |= (static_cast<T>(1) << ind); }
template<typename T> void breset(T& mask, const usize ind) { mask &= ~(static_cast<T>(1) << ind); }
template<typename T> void bflip(T& mask, const usize ind) { mask ^= (static_cast<T>(1) << ind); }
template<typename T> void bset(T& mask, const usize ind, const bool b) { (b ? bset(mask, ind) : breset(mask, ind)); }
template<typename T> constexpr T bcut(const T mask, const usize ind) { return ind == 0 ? static_cast<T>(0) : static_cast<T>((static_cast<u64>(mask) << (64 - ind)) >> (64 - ind)); }
template<typename T> bool chmin(T& a, const T& b) { return (a > b ? a = b, true : false); }
template<typename T> bool chmax(T& a, const T& b) { return (a < b ? a = b, true : false); }
constexpr unsigned int mod                  = 1000000007;
template<typename T> constexpr T inf_v      = std::numeric_limits<T>::max() / 4;
template<typename Real> constexpr Real pi_v = Real{3.141592653589793238462643383279502884};
template<typename T>
T read()
{
    T v;
    return std::cin >> v, v;
}
template<typename T>
std::vector<T> read_vec(const std::size_t size)
{
    std::vector<T> v(size);
    for (auto& e : v) { std::cin >> e; }
    return v;
}
template<typename... Types>
auto read_vals() { return std::tuple<std::decay_t<Types>...>{read<Types>()...}; }
#define SHOW(...) static_cast<void>(0)
template<typename T>
std::vector<T> make_v(const std::size_t size, T v) { return std::vector<T>(size, v); }
template<class... Args>
auto make_v(const std::size_t size, Args... args) { return std::vector<decltype(make_v(args...))>(size, make_v(args...)); }

template<usize lg>
class wavelet_matrix
{
public:
    using value_type = u64;
    template<typename InIt>
    wavelet_matrix(const InIt first, const InIt last) : sz{static_cast<usize>(std::distance(first, last))}
    {
        for (usize i = 0; i < lg; i++) { zero[i] = 0, table[i] = fid(sz); }
        std::vector<value_type> v{first, last};
        std::vector<value_type> z(sz), o(sz);
        usize zn = 0, on = 0;
        for (usize d = 0; d < lg; d++) {
            zn = 0, on = 0;
            for (usize i = 0; i < sz; i++) {
                const bool b = btest(v[i], lg - d - 1);
                table[d].set(i, b), (b ? o[on++] : z[zn++]) = v[i];
            }
            table[d].build(), zero[d] = zn, std::swap(v, z);
            for (usize i = 0; i < on; i++) { v[zn + i] = o[i]; }
        }
    }
    usize less_than(usize l, usize r, const value_type v) const
    {
        assert(l <= r);
        usize ans = 0;
        for (usize i = 0; i < lg; i++) {
            const usize zl = table[i].zero(l), zr = table[i].zero(r), z = zero[i];
            if (btest(v, lg - i - 1)) {
                ans += zr - zl, l += z - zl, r += z - zr;
            } else {
                l = zl, r = zr;
            }
        }
        return ans;
    }
    usize range_freq(const usize l, const usize r, const value_type vmin, const value_type vsup) const { return less_than(l, r, vsup) - less_than(l, r, vmin); }
    value_type quantile(usize l, usize r, usize n) const
    {
        assert(l <= r), assert(r - l > n);
        value_type ans = 0;
        for (usize i = 0; i < lg; i++) {
            const usize zl = table[i].zero(l), zr = table[i].zero(r), z = zero[i];
            if (n >= zr - zl) {
                ans += value_type(1) << (lg - i - 1), l += z - zl, r += z - zr, n -= (zr - zl);
            } else {
                l = zl, r = zr;
            }
        }
        return ans;
    }

private:
    static constexpr usize bucket_size = sizeof(value_type) * 8;
    static constexpr usize bslog       = log2p1(bucket_size) - 1;
    static constexpr usize wind(const usize n) { return n >> (bslog); }
    static constexpr usize bind(const usize n) { return bcut(n, bslog); }
    class fid
    {
    private:
        usize sz, bn;
        std::vector<value_type> data;
        std::vector<usize> large;

    public:
        fid() : sz{0} {}
        fid(const usize b) : sz{b}, bn{wind(sz) + 2}, data(bn, 0), large(bn, 0) {}
        void build()
        {
            for (usize i = 1; i < large.size(); i++) { large[i] = large[i - 1] + popcount(data[i - 1]); }
        }
        bool operator[](const usize n) const { return btest(data[wind(n)], bind(n)); }
        void set(const usize n, const bool b) { bset(data[wind(n)], bind(n), b); }
        usize one(const usize n) const { return large[wind(n)] + popcount(bcut(data[wind(n)], bind(n))); }
        usize zero(const usize n) const { return n - one(n); }
    };
    const usize sz;
    std::array<usize, lg> zero;
    std::array<fid, lg> table;
};
int main()
{
    const auto n     = read<usize>();
    const auto a     = read_vec<ll>(n);
    auto b           = a;
    constexpr ll MAX = 1000000000;
    for (usize i = 0; i < n; i++) { b[i] += MAX; }
    wavelet_matrix<32> wm(b.begin(), b.end());
    auto median = [&](const usize l, const usize r) -> ll {
        ll inf = -1, sup = 2 * MAX + 1;
        while (sup - inf > 1) {
            const ll mid                  = (inf + sup) / 2;
            const usize low               = wm.less_than(l, r, mid);
            (low * 2 < r - l ? inf : sup) = mid;
        }
        return inf - MAX;
    };
    ll ans = 0;
    for (usize k = 1; k <= n; k++) {
        std::vector<ll> left{0}, right{0};
        for (usize l = 0; l + k <= n; l += k) { left.push_back(median(l, l + k) * (ll)k); }
        for (int r = (int)n; r - (int)k >= 0; r -= k) { right.push_back(median(r - k, r) * (ll)k); }
        const usize s = left.size() - 1;
        for (usize i = 1; i <= s; i++) { left[i] += left[i - 1], right[i] += right[i - 1]; }
        for (usize i = 1; i <= s; i++) { chmax(left[i], left[i - 1]), chmax(right[i], right[i - 1]); }
        for (usize i = 0; i <= s; i++) { chmax(ans, left[i] + right[s - i]); }
    }
    std::cout << ans << std::endl;
    return 0;
}