#include<stdio.h>int main (){  #ifdef ONLINE_JUDGE  #else  freopen ("in.txt","r",stdin);  #endif  int n,i;  while(scanf("%d",&n)!=EOF){   int a[n],s=1;    for (i=0;i<n;++i)    scanf("%d",&a[i]);    for (i=0;i<n;++i)    if(0!=a[i]%2)        s*=a[i];    printf("%d",s);    printf("\n");}  return 0;}