/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author aajisaka
 */

#include<bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SPEED ios_base::sync_with_stdio(false);cin.tie(nullptr)
#define rep(i,n) for(int i=0; i<(int)(n); i++)
#define all(v) v.begin(), v.end()
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

using ll = long long;
using P = pair<ll, ll>;

constexpr double PI = 3.14159265358979323846;
mt19937_64 engine(chrono::steady_clock::now().time_since_epoch().count());

class CLCMs {
public:
    void solve(istream& cin, ostream& cout) {
      SPEED;
      int n; cin >> n;
      vector<int> a(n);
      rep(i, n) {
        cin >> a[i];
      }
      vector<P> vec;
      for(int k=1; k<=n; k++) {
        for(int i=0; i+k<=n; i+=k) {
          vec.emplace_back(i,i+k);
        }
        for(int i=n; i-k>=0; i-=k) {
          vec.emplace_back(i-k, i);
        }
      }
      sort(all(vec));
      vec.erase(unique(all(vec)), vec.end());

      int s = vec.size();
      map<P, int> mp;

      priority_queue<int> que1;
      priority_queue<int, vector<int>, greater<>> que2;
      int now = -1;
      int k = 0;
      int cnt = 0;
      for(int idx = 0; idx < s; idx++) {
        int i = vec[idx].first;
        int j = vec[idx].second;
        if (now != i) {
          while(!que1.empty()) que1.pop();
          while(!que2.empty()) que2.pop();
          que1.push(INT_MIN);
          que2.push(INT_MAX);
          k = i;
          cnt = 0;
        }
        while(k < j) {
          if (cnt%2==0) {
            que1.push(a[k]);
          } else {
            que2.push(a[k]);
          }
          if (que1.top() > que2.top()) {
            int c1 = que1.top(); que1.pop();
            int c2 = que2.top(); que2.pop();
            que2.push(c1); que1.push(c2);
          }
          cnt++;
          k++;
        }
        mp[P(i, j)] = que1.top();
      }

      ll ans = 0;
      for(int j=1; j<=n; j++) {
        ll no = 0;
        ll ma = 0;
        vector<ll> v1, v2;
        v1.push_back(0);
        for(int i=0; i+j<=n; i+=j) {
          no += mp[P(i, i+j)];
          chmax(ma, no);
          v1.push_back(ma);
        }
        no = 0;
        ma = 0;
        v2.push_back(0);
        for(int i=n; i-j>=0; i-=j) {
          no += mp[P(i-j, i)];
          chmax(ma, no);
          v2.push_back(ma);
        }
        reverse(all(v2));
        int r = v1.size();
        rep(i, r) {
          debug(i, v1[i], v2[i]);
          chmax(ans, (v1[i]+v2[i])*j);
        }
      }
      cout << ans << endl;
    }
};

signed main() {
  CLCMs solver;
  std::istream& in(std::cin);
  std::ostream& out(std::cout);
  solver.solve(in, out);
  return 0;
}