#include <bits/stdc++.h>

int main(){
    using namespace std;
    unsigned long N;
    cin >> N;
    if(N & 1){
        if(N == 1){
            unsigned long A;
            cin >> A;
            cout << A << endl;
        }else puts("1");
        return 0;
    }
    set<unsigned long> pq(istream_iterator<unsigned long>{cin}, istream_iterator<unsigned long>{});
    for(unsigned long i{}; i < N; i += 2){
        unsigned long a{*begin(pq)};
        pq.erase(begin(pq));
        unsigned long b{*begin(pq)};
        pq.erase(begin(pq));
        pq.emplace(a * b);
        if(i + 2 < N){
            pq.erase(prev(end(pq)));
            pq.erase(prev(end(pq)));
            pq.emplace(1);
        }
    }
    cout << *pq.begin() << endl;
    return 0;
}