#include <iostream>
using namespace std;
int main(){
int a[100], n;
while (cin >> n){
int s = 1;
for (int i = 0; i < n; i++)
cin >> a[i];
for (int i = 0; i < n; i++){
if (a[i] % 2 == 1)
s *= a[i];
}
cout << s << endl;
n--;
}
return 0;
}