#include <cstdio>
#include <cstring>
#include <random>
#include <vector>
#include <algorithm>
#include <array>
#include <functional>

using namespace std;

int main(){
	int n;
	int _=scanf("%d",&n);
	vector<int64_t> a;
	for(int i=0;i<n;i++){
		int t;
		_=scanf("%d",&t);
		a.push_back(t);
	}
	array<int64_t,2> s;
	s[0]=s[1]=a[0];
	for(int i=1;i<n;i++){
		array<int64_t,6> t={s[0]+a[i],s[0]-a[i],s[0]*a[i],s[1]+a[i],s[1]-a[i],s[1]*a[i]};
		auto u=minmax_element(t.begin(),t.end());
		s[0]=*u.first;
		s[1]=*u.second;
	}
	printf("%ld\n",max(s[0],s[1]));
	return 0;
}