import java.util.Scanner;public class Main{		public static void main(String args[]){		Scanner scan = new Scanner(System.in);		while(scan.hasNext())		{			String str[] = scan.nextLine().split(" ");			int n = Integer.parseInt(str[0]);			int num[] = new int[n];			for(int i=1; i<str.length; i++)			{				num[i-1] = Integer.parseInt(str[i]);			}			int sum = 1;			for(int i=0; i<num.length; ++i)			{				if(num[i]%2 == 1)					sum *= num[i];			}			System.out.PRintln(sum);		}	}}