#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001LL

vector<long long> get(vector<long long> a){
	int n = a.size();
	vector<long long> res(n+1,-Inf64);
	long long cs = 0;
	long long mins = 0;
	rep(i,n){
		cs += a[i];
		res[i+1] = cs - mins;
		mins = min(mins,cs);
	}
	rep(i,n){
		res[i+1] = max(res[i+1],res[i]);
	}
	return res;
}

int main(){
	
	int n;
	cin>>n;
	vector<long long> a(n);
	rep(i,n){
		cin>>a[i];
	}
	vector<vector<long long>> res(4);
	rep(i,2){
		rep(j,2){
			res[i*2+j] = get(a);
			reverse(a.begin(),a.end());
		}
		rep(j,n)a[j] *= -1;
	}
	long long ans = -Inf64;
	rep(i,2){
		rep(j,2){
			for(int k=1;k<n;k++){
				long long v0 = res[i*2][k];
				long long v1 = res[j*2+1][n-k];
				if(i)v0 *= -1;
				if(j)v1 *= -1;
				ans = max(ans,v0*v1);
			}
		}
	}
	cout<<ans<<endl;
	return 0;
}