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

template<typename T> void chmin(T &a,T b){if(a>b) a=b;}
template<typename T> void chmax(T &a,T b){if(a<b) a=b;}

signed main(){
  Int n;
  cin>>n;
  vector<Int> a(n);
  for(Int i=0;i<n;i++) cin>>a[i];
  vector< vector<Int> > dp(2,vector<Int>(n+1,0));
  auto check=[&](Int i,Int x){
    chmin(dp[0][i+1],x);
    chmax(dp[1][i+1],x);
  };
  for(Int i=0;i<n;i++){
    check(i,dp[0][i]+a[i]);
    check(i,dp[0][i]-a[i]);
    check(i,dp[0][i]*a[i]);
    if(a[i]) check(i,dp[0][i]/a[i]);
    check(i,dp[1][i]+a[i]);
    check(i,dp[1][i]-a[i]);
    check(i,dp[1][i]*a[i]);
    if(a[i]) check(i,dp[1][i]/a[i]);
  }
  cout<<dp[1][n]<<endl;
  return 0;
}