#include <iostream>
using namespace std;
int main()
{
int n,t,x=1;
while(cin>>n)
{
x=1;
while (n--)
{
cin>>t;
if(t%2==1)
x=x*t;
}
cout<<x<<endl;
}
}
#include <iostream>
using namespace std;
int main()
{
int n,t,x=1;
while(cin>>n)
{
x=1;
while (n--)
{
cin>>t;
if(t%2==1)
x=x*t;
}
cout<<x<<endl;
}
}