#include <iostream>
using namespace std;
int main(){
  int n;cin>>n;
  long long z;cin>>z;
  long long nwmx = z;
  long long nwmn = z;
  for(int i = 0; n-1 > i; i++){
    long long x;cin>>x;
    long long nexmx = max(nwmx+x,nwmn+x);
    long long nexmn = min(nwmx+x,nwmn+x);
    nexmx = max(nexmx,max(nwmx-x,nwmn-x));
    nexmn = min(nexmn,min(nwmx-x,nwmn-x));
    nexmx = max(nexmx,max(nwmx*x,nwmn*x));
    nexmn = min(nexmn,min(nwmx*x,nwmn*x));
    if(x!=0){
      nexmx = max(nexmx,max(nwmx/x,nwmn/x));
      nexmn = min(nexmn,min(nwmx/x,nwmn/x));
    }
    nwmx = nexmx;
    nwmn = nexmn;
  }
  cout << nwmx << endl;
}