#include<cstdio>
#include<cstdlib>


typedef long long ll;


void max_u(ll& d, ll v)
{
	if(d<v) d=v;
}


void min_u(ll& d, ll v)
{
	if(d>v) d=v;
}


int main(void)
{
	int n, a[16];
	int i, j;
	ll result_p, result_n, t_p[4], t_n[4];

	while(scanf("%d", &n)==1)
	{
		for(i=0;i<n;i++)
		{
			scanf("%d", &a[i]);
		}
		result_p=result_n=a[0];
		for(i=1;i<n;i++)
		{
			for(j=0;j<4;j++)
			{
				t_p[j]=result_p;
				t_n[j]=result_n;
			}

			t_p[0]+=a[i];
			t_p[1]-=a[i];
			t_p[2]*=a[i];

			t_n[0]+=a[i];
			t_n[1]-=a[i];
			t_n[2]*=a[i];

			result_p=result_n=t_p[0];
			for(j=0;j<3;j++)
			{
				max_u(result_p, t_p[j]);
				max_u(result_p, t_n[j]);
				min_u(result_n, t_p[j]);
				min_u(result_n, t_n[j]);
			}
		}
		printf("%lld\n", result_p);
	}

	return 0;
}