#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ld = long double;
int main(){
    cout << fixed << setprecision(15);
    ll N;
    cin >> N;
    vector<ll> A(N);
    for(ll i = 0;i < N;i++) cin >> A[i];
    sort(A.begin(),A.end());
    if(N == 1) cout << A[0] << endl;
    else if(N == 2) cout << A[0] * A[1] << endl;
    else if(N % 2 == 1) cout << 1 << endl;
    else{
        cout << A[0] << endl;
    }
}