#include<bits/stdc++.h>
using namespace std;

int solve_mx(int a, int num){
	if(a > 0){
		int pl = num + a;
		int ml = num * a;
		return max(pl, ml);
	}else{
		return num - a;
	}
}

int solve_mn(int a, int num){
	if(a > 0){
		int mi = num - a;
		int di = num / a;
		return min(mi, di);
	}else{
		int pl = num + a;
		int ml = num * a;
		return min(pl, ml);
	}
}


int main(){
	int n;
	cin >> n;

	int mx, mn;
	int a;
	
	cin >> a;
	if(a > 0){
		mx = a;
		mn = -a;
	}else{
		mx = -a;
		mn = a;
	}
	
	for(int i = 1; i < n - 1; i++){
		cin >> a;
		mx = solve_mx(a, mx);
		mn = solve_mn(a, mn);
	}

	cin >> a;
	if(a < 0)mn *= a;
	else mn = solve_mn(a, mn);
	mx = solve_mx(a, mx);

	cout << max(mn, mx) << endl;
}