#include <iostream>

using namespace std;

int main(){
  int N, a[16];
  int cnt=0;
  int flag;
  cin >> N;
  for (int i=0; i<N; i++) cin >> a[i];
  int total = a[0];
  for (int i=0; i<N; i++){
    if (a[i] < 0){
      flag = i;
      break;
    }
  }
  for (int i=0; i<N; i++){
    if (a[i] <= -2) cnt++;
  }
  cnt = cnt % 2;
  if (cnt == 0){
    for (int i=1; i<N; i++){
      if ((a[i] == 0)||(a[i] == 1)){
        total = total + a[i];
      }
      else if (a[i] >= 2){
        if (total == 0) total = total + a[i];
        else total = total * a[i];
      }
      else if (a[i] == -1){
        total = total - a[i];
      }
      else {
        if (total == 0) total = total - a[i];
        else total = total * a[i];
      }
    }
  }
  else if (cnt == 1){
    for (int i=1; i<N; i++){
      if ((a[i] == 0)||(a[i] == 1)){
        total = total + a[i];
      }
      else if (a[i] >= 2){
        if (total == 0) total = total + a[i];
        else total = total * a[i];
      }
      else {
        if (i == flag) total = total - a[i];
        else total = total * a[i];
      }
    }
  }
  cout << total << endl;
  return 0;
}