#include<bits/stdc++.h>
using namespace std;
#ifdef LOCAL_DEBUG
  #include "LOCAL_DEBUG.hpp"
#endif
#define int long long
const int INF = 1LL << 60;

signed main(){

  int n; cin >> n;
  vector<int> a(n);
  for(int i = 0; i < n; i++){
    cin >> a[i];
  }

  static int dp[21][2];
  for(int i = 0; i < n; i++){
    dp[i][0] = INF;
    dp[i][1] = -INF;
  }
  dp[0][0] = dp[0][1] = a[0];
  for(int i = 1; i < n; i++){
    dp[i][0] = min(dp[i][0], dp[i-1][0] + a[i]);
    dp[i][0] = min(dp[i][0], dp[i-1][0] - a[i]);
    dp[i][0] = min({dp[i][0], dp[i-1][0] * a[i], dp[i-1][1] * a[i]});
    if(a[i] != 0) dp[i][0] = min(dp[i][0], dp[i-1][0] / a[i]);
    dp[i][1] = max(dp[i][1], dp[i-1][1] + a[i]);
    dp[i][1] = max(dp[i][1], dp[i-1][0] - a[i]);
    dp[i][1] = max({dp[i][1], dp[i-1][1] * a[i], dp[i-1][0] * a[i]});
    if(a[i] != 0) dp[i][1] = max(dp[i][1], dp[i-1][1] / a[i]);
    //cout << dp[i][0] << " " << dp[i][1] << endl;
  }
  cout << max(dp[n-1][0], dp[n-1][1]) << endl;

  return 0;
}