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

#define FOR(i,l,r) for(int i = (int) (l);i < (int) (r);i++)
#define ALL(x) x.begin(),x.end()
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

int N;
ll dp [17] [2];
const ll INF = 1e18;

int main()
{
	scanf("%d",&N);
	vector<ll> A(N);
	FOR(i,0,N){
		scanf("%lld",&A [i]);
	}
	FOR(i,1,N + 1){
		dp [i] [0] = -INF;
		dp [i] [1] = INF;
	}
	dp [1] [0] = dp [1] [1] = A.front();
	FOR(i,1,N) FOR(j,0,2){
		chmax(dp [i + 1] [0],dp [i] [j] + A [i]);
		chmin(dp [i + 1] [1],dp [i] [j] + A [i]);
		chmax(dp [i + 1] [0],dp [i] [j] - A [i]);
		chmin(dp [i + 1] [1],dp [i] [j] - A [i]);
		chmax(dp [i + 1] [0],dp [i] [j] * A [i]);
		chmin(dp [i + 1] [1],dp [i] [j] * A [i]);
		if(A [i]){
			chmax(dp [i + 1] [0],dp [i] [j] / A [i]);
			chmin(dp [i + 1] [1],dp [i] [j] / A [i]);
		}
	}

	printf("%lld\n",dp [N] [0]);

	return 0;
}