// HDOJ 2006 求奇数的成绩// @author:	bos// @date:	2012.2.16#include 
    
     int main(){	int n;	int a[100000];	int result;	while (scanf("%d", &n)!= EOF)	{			int i;			result= 1;			for (i= 0; i< n; i++)			{				scanf("%d", &a[i]);				if(a[i]% 2!= 0) result*= a[i];			}			printf("%d\n", result);			}	return 0;}