HDU 2006

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