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

int main() {
    int N;
    cin >> N;
    vector<long long>A(N);
    for(int i = 0; i < N; i++) {
        cin >> A[i];
    }
    sort(A.rbegin(),A.rend());
    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[N/2] << endl;
    }
}

/*
 1 2 3 4
 2 3 4
 2 1
 */