#include <iostream>
using namespace std;
int main()
{
int m;
while(cin>>m){
int total=1;
for(int i=0;i<m;i++)
{
int a;
cin>>a;
if(a%2!=0)
{total=total*a;}
}
cout<<total<<endl;}
return 0;
}
#include <iostream>
using namespace std;
int main()
{
int m;
while(cin>>m){
int total=1;
for(int i=0;i<m;i++)
{
int a;
cin>>a;
if(a%2!=0)
{total=total*a;}
}
cout<<total<<endl;}
return 0;
}