#include<bits/stdc++.h> using namespace std; typedef long long ll; int N; ll a[16]; ll mini[16]; ll maxm[16]; int main(){ cin>>N; for(int i=0;i<N;i++){ cin>>a[i]; } mini[0]=maxm[0]=a[0]; for(int i=1;i<N;i++){ mini[i]=min( mini[i-1]+a[i] , mini[i-1]-a[i] ); mini[i]=min( mini[i], mini[i-1] * a[i] ); if(a[i])mini[i]=min( mini[i], mini[i-1] / a[i] ); mini[i]=min( mini[i], maxm[i-1] * a[i] ); if(a[i])mini[i]=min( mini[i], maxm[i-1] / a[i] ); maxm[i]=max( maxm[i-1]+a[i] , maxm[i-1]-a[i] ); maxm[i]=max( maxm[i], mini[i-1] * a[i] ); if(a[i])maxm[i]=max( maxm[i], mini[i-1] / a[i] ); maxm[i]=max( maxm[i], maxm[i-1] * a[i] ); if(a[i])maxm[i]=max( maxm[i], maxm[i-1] / a[i] ); } cout<<maxm[N-1]<<endl; return 0; }