package com.test;
import java.util.*;
import java.io.*;
public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int r,result=1;
while(sc.hasNextInt()){
r=sc.nextInt();
int a[]=new int[r];
for(int i=0;i<r;i++){
a[i]=sc.nextInt();
}
for(int s:a){
if(s%2!=0) result*=s;
}
System.out.println(result);
result=1;
}
}
}