#include <bits/stdc++.h>
using namespace std;
const long long INF = 100000000000;
int main(){
  int N;
  cin >> N;
  vector<long long> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<long long> dp(N + 1, 0);
  for (int i = 0; i < N; i++){
    int L = i, R = i;
    while (L > 0){
      if (A[L - 1] <= A[i]){
        L--;
      } else {
        break;
      }
    }
    while (R < N - 1){
      if (A[R + 1] <= A[i]){
        R++;
      } else {
        break;
      }
    }
    for (int j = L; j <= i; j++){
      for (int k = i + 1; k <= R + 1; k++){
        dp[k] = max(dp[k], dp[j] + (long long) (k - j) * abs(A[i]));
      }
    }
  }
  cout << dp[N] << endl;
}