#include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;
using lint=long long;

const long long INF=1LL<<61;

int n,a[16];
char op[15];

lint dfs(int i){
	if(i==n-1){
		lint res=a[0];
		rep(j,n-1){
			if(op[j]=='+') res+=a[j+1];
			if(op[j]=='-') res-=a[j+1];
			if(op[j]=='*') res*=a[j+1];
		}
		return res;
	}

	lint res=-INF;
	op[i]='+';
	res=max(res,dfs(i+1));
	op[i]='-';
	res=max(res,dfs(i+1));
	op[i]='*';
	res=max(res,dfs(i+1));
	return res;
}

int main(){
	scanf("%d",&n);
	rep(i,n) scanf("%d",&a[i]);
	printf("%lld\n",dfs(0));
	return 0;
}