#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using ld=long double;
constexpr ll INF=(1ll<<60);
#define rep(i,n) for (ll i=0;i<(ll)(n);i++)
#define replr(i,l,r) for (ll i=(ll)(l);i<(ll)(r);i++)
#define all(v) v.begin(),v.end()
#define len(v) ((ll)v.size())
template<class T> inline bool chmin(T &a,T b){
    if(a>b){
        a=b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T &a,T b){
    if(a<b){
        a=b;
        return true;
    }
    return false;
}
ll f(vector<ll> a){
    ll n=len(a);
    vector<ll> l(n+1,-INF),r(n+1,-INF);
    l[0]=-INF;
    rep(i,n){
        l[i+1]=max(l[i]+a[i],a[i]);
    }
    replr(i,1,n+1) chmax(l[i],l[i-1]);
    r[n]=-INF;
    for(ll i=n-1;0<=i;i--){
        r[i]=max(r[i+1]+a[i],a[i]);
    }
    for(ll i=n-2;0<=i;i--) chmax(r[i],r[i+1]);
    ll ans=-INF;

    replr(i,1,n){
        chmax(ans,l[i]*r[i]);
    }
    return ans;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll n;
    cin >> n;
    vector<ll> a(n);
    rep(i,n) cin >> a[i];
    ll ans=-INF;
    chmax(ans,f(a));
    rep(i,n) a[i]*=-1;
    chmax(ans,f(a));
    cout << ans << '\n';
}