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

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

template < typename T >
void vprint(T &V){
	for(auto v : V){
    	cout << v << " ";
	}
	cout << endl;
}

// dp[i][j]
// j : 0:max 1:min
ll dp[100][2];

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll N;
    cin >> N;

    vector<ll> A(N);
    FOR(i, 0, N){
        cin >> A.at(i);
    }

    dp[0][0] = A[0];
    dp[0][1] = A[0];
    
    FOR(i, 1, N){
        ll ma = -inf;
        ll mi = inf;

        FOR(j, 0, 2){
            ll a = dp[i-1][0] + A[i];
            chmax(ma, a); chmin(mi, a);

            ll b = dp[i-1][0] - A[i];
            chmax(ma, b); chmin(mi, b);
            
            ll c = dp[i-1][0] * A[i];
            chmax(ma, c); chmin(mi, c);

            if(A[i]!=0){
                ll d = dp[i-1][0] / A[i];
                chmax(ma, d); chmin(mi, d);
            }
        }
        dp[i][0] = ma;
        dp[i][1] = mi;
    }

    ll ans = dp[N-1][0];
    p(ans);
    
    return 0;
}