#include <bits/stdc++.h>
using namespace std;
//#include<atcoder/all>
//using namespace atcoder;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
constexpr ll MAX = 2000000000000000000;
constexpr ld PI = 3.14159265358979;
constexpr ll MOD = 0;//2024948111;
ld dotorad(ld K){return PI * K / 180.0;}
ld radtodo(ld K){return K * 180.0 / PI;}
mt19937 mt;
void randinit(){srand((unsigned)time(NULL));mt = mt19937(rand());}
int main(){
    ll N;
    cin >> N;
    vector<ll> A(N);
    for(ll i = 0;i < N;i++) cin >> A[i];
    if(N == 1) cout << A[0] << endl;
    else if(N % 2 == 1) cout << 1 << endl;
    else{
        sort(A.begin(),A.end());
        A.emplace_back(A[0] * A[1]);
        A.erase(A.begin());
        A.erase(A.begin());
        sort(A.begin(),A.end());
        cout << A[0] << endl;
    }
}