#include<map>
#include<set>
#include<list>
#include<cmath>
#include<queue>
#include<stack>
#include<cstdio>
#include<string>
#include<vector>
#include<complex>
#include<cstdlib>
#include<cstring>
#include<numeric>
#include<sstream>
#include<iostream>
#include<algorithm>
#include<functional>
 
#define mp       make_pair
#define pb       push_back
#define all(x)   (x).begin(),(x).end()
#define YES() printf("YES\n")
#define NO() printf("NO\n")
 
using namespace std;
 
#define int long long
//typedef    long long          ll;
typedef    unsigned long long ull;
typedef    vector<bool>       vb;
typedef    vector<int>        vi;
typedef    vector<vb>         vvb;
typedef    vector<vi>         vvi;
typedef    pair<int,int>      P;
 
const int INF=1e+9;
const double EPS=1e-9;
const int MOD=1000000007;
 
const int dx[]={1,0,-1,0},dy[]={0,-1,0,1};

signed main(){
	int n,a[16],res = 0;
	cin >> n;
	for(int i = 0;i < n;i++) {
		cin >> a[i];
		if(!i) res = a[i];
		else{
				if(a[i]) res = max(max(res + a[i],res - a[i]),max(res * a[i],(int)floor((double)res / (double)a[i])));
			else res = res = max(max(res + a[i],res - a[i]),res * a[i]);
		}
	}
	cout << res << endl;
	return 0;
}