#include<stdio.h>
#include<stdlib.h>
#include<iostream>
using namespace std;
int main()
{
int a[10000];
int n;
while(scanf("%d",&n)!=EOF)
{
int s=1;
for(int i=0;i<n;i++)
{
cin>>a[i];
if(a[i]>=2)
{
if(a[i]%2!=0)
s=s*a[i];
}
}
cout<<s<<endl;
}
return 0;
}