#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int N;
  cin >> N;
  vector<ll> v;
  rep(i,N){
    ll a;
    cin >> a;
    v.push_back(a);
  }

  ll mn = v[0], mx = v[0];
  REP(i,1,N){
    ll n_mn = mn, n_mx = mx;
    //+
    n_mx = max(n_mx, mx + v[i]);
    n_mn = min(n_mn, mn + v[i]);
    //-
    n_mx = max(n_mx, mx - v[i]);
    n_mn = min(n_mn, mn - v[i]);
    //*
    n_mx = max(n_mx, mx * v[i]);
    n_mx = max(n_mx, mn * v[i]);
    n_mn = min(n_mn, mx * v[i]);
    n_mn = min(n_mn, mn * v[i]);
    if(v[i] != 0){
      n_mx = max(n_mx, mx / v[i]);
      n_mx = max(n_mx, mn / v[i]);
      n_mn = min(n_mn, mx / v[i]);
      n_mn = min(n_mn, mn / v[i]);
    }
    
    mx = n_mx;
    mn = n_mn;
  }

  cout << mx << endl;
  
  return 0;
}