#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;
}


void solve_r(ll& result, ll v, int a[], int d, int n)
{
	if(d>=n)
	{
		max_u(result, v);
		return;
	}

	solve_r(result, v+a[d], a, d+1, n);
	solve_r(result, v-a[d], a, d+1, n);
	solve_r(result, v*a[d], a, d+1, n);
	if(a[d]) solve_r(result, v/a[d], a, d+1, n);
}


ll solve(int a[], int n)
{
	ll result=0;
	int i;

	for(i=0;i<n;i++) result+=a[i];
	solve_r(result, a[0], a, 1, n);
	return result;
}


int main(void)
{
	int n, a[16];
	int i;

	while(scanf("%d", &n)==1)
	{
		for(i=0;i<n;i++)
		{
			scanf("%d", &a[i]);
		}
		printf("%lld\n", solve(a, n));
	}

	return 0;
}