#include <bits/stdc++.h>

using namespace std;

typedef long long int64;
const int64 INF = 1LL << 58;


int64 N, A[16];
int64 dp1[16], dp2[16];

int64 createArray(int idx, int sz, int64 val)
{
  if(idx == sz) {
    return (val);
  }
  int64 ret = -INF;
  ret = max(ret, createArray(idx + 1, sz, val + A[idx]));
  ret = max(ret, createArray(idx + 1, sz, val - A[idx]));
  ret = max(ret, createArray(idx + 1, sz, val * A[idx]));
  if(A[idx] != 0) ret = max(ret, createArray(idx + 1, sz, val / A[idx]));
  return (ret);
}

int main()
{
  cin >> N;
  for(int i = 0; i < N; i++) {
    cin >> A[i];
  }

  fill_n(dp1, 16, -INF);
  fill_n(dp2, 16, INF);
  dp1[0] = A[0];
  dp2[0] = A[0];
  for(int i = 1; i < N; i++) {
    dp1[i] = max({dp1[i - 1] + A[i], dp1[i - 1] - A[i], dp1[i - 1] * A[i]});
    dp1[i] = max({dp1[i], dp2[i - 1] + A[i], dp2[i - 1] - A[i], dp2[i - 1] * A[i]});
    dp2[i] = min({dp1[i - 1] + A[i], dp1[i - 1] - A[i], dp1[i - 1] * A[i]});
    dp2[i] = min({dp2[i], dp2[i - 1] + A[i], dp2[i - 1] - A[i], dp2[i - 1] * A[i]});

    if(A[i] != 0) {
      dp1[i] = max({dp1[i], dp1[i - 1] / A[i], dp2[i - 1] / A[i]});
      dp2[i] = min({dp2[i], dp2[i - 1] / A[i], dp1[i - 1] / A[i]});
    }

  }

  cout << dp1[N - 1] << endl;

}