#include<iostream>
using namespace std;
int main()
{
    int n;
    int num, sum;
    while (cin >> n)
    {
        sum = 1;
        for (int i = 0; i < n; i++)
        {
            cin >> num;
            if (num % 2 != 0)
            {
                sum *= num;
            }
        }
        cout << sum << endl;
    }
    system("pause");
    return 0;
}