#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,b) for(int i=b-1;i>=0;i--)
#define rbit(i,a) for(int i=0;i<(1<<a);i++)
#define all(x) (x).begin(),(x).end()
#define pb(x) push_back(x);
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; }
typedef long long ll;
typedef long double lld;
using namespace std;
using namespace atcoder;
using mint=static_modint<1000000007>;
const ll mod=998244353;
//const ll mod=1e9+7;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
const string zton="0123456789";
const string atoz="abcdefghijklmnopqrstuvwxyz";
const ll inf=(1ll<<60);
ll gcd(ll a,ll b){
    ll r;
    r=a%b;
    if(r==0){
        return b;
    }
    else{
        return gcd(b,r);
    }
}
typedef pair<ll,int> P;

int main(void){
    int N;cin >> N;
    multiset<ll> A;
    rep(i,0,N){
        ll a;cin >> a;
        A.insert(a);
    }
    A.insert(inf);
    rep(i,0,N-1){
        if(i%2==0){
            auto x_=A.lower_bound(0);
            A.erase(x_);
            auto y_=A.lower_bound(0);
            A.erase(y_);
            ll x=*x_;
            ll y=*y_;
            ll z=x*y;
            A.insert(z);
        }
        else if(i%2==1){
            auto y_=A.lower_bound(inf);
            y_=prev(y_);
            A.erase(y_);
            auto x_=A.lower_bound(inf);
            x_=prev(x_);
            A.erase(x_);
            ll x=*x_;
            ll y=*y_;
            ll z=(x+y-1)/y;
            A.insert(z);
        }
    }
    auto ans_=A.lower_bound(0);
    ll ans=*ans_;
    cout << ans << endl;
}