#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n + 1];
  for (int i = 1; i <= n; i++) cin >> a[i];
  int k = 0;
  for (int i = 1; i <= n; i++) {
    int s = 0, t = 1;
    for (int j = 1; j <= n; j++) {
      if (a[j] * (j - i) > s) {
        s = a[j] * (j - i);
        t = j;
      }
    }
    a[t] = -1;
    k += s;
  }
  cout << k;
  return 0;
}
