#include <bits/stdc++.h>
using namespace std;

#define int long long

#define rep(i,s,n) for(int i = s;i<n;i++)
#define repe(i,s,n) for(int i = s;i<=n;i++)
#define rrep(i,s,n) for(int i = (n)-1;i>=(s);i--)
#define all(v) (v).begin(),(v).end()
#define pb push_back
#define fi first
#define se second
#define chmin(a,b) a=min((a),(b))
#define chmax(a,b) a=max((a),(b))
typedef long long ll;
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
typedef pair<pint,int> P1;
typedef pair<int,pint> P2;
typedef pair<pint,pint>PP;
static const ll maxLL = (ll)1 << 62;
const ll MOD=1000000007;
const ll INF=1e18;
int dx[]={0,0,1,-1};
int dy[]={-1,1,0,0};


int N;
int dp[33][2];
int a[100010];

void calc(int i){
    chmax(dp[i+1][0],max({dp[i][0]+a[i+1],dp[i][0]-a[i+1],dp[i][0]*a[i+1],dp[i][1]*a[i+1]}));
    chmin(dp[i+1][1],min({dp[i][1]+a[i+1],dp[i][1]-a[i+1],dp[i][1]*a[i+1],dp[i][0]*a[i+1]}));
    if(a[i+1]!=0){
        chmax(dp[i+1][0],dp[i][0]/a[i+1]);
        chmin(dp[i+1][1],dp[i][1]/a[i+1]);
    }
}


signed main(){
    cin.tie(0);
	ios::sync_with_stdio(false);
    cin>>N;
    rep(i,0,N)cin>>a[i];
    dp[0][0]=dp[0][1]=a[0];
    rep(i,0,N-1){
        calc(i);
    }
    cout<<dp[N-1][0]<<"\n";
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    return 0;
}