//Reading indefinitely from stdin
//Print all even numbers entered by the user
import java.util.Scanner;
class Even
{
	public static void main (String [] args) 
	{
		Scanner in = new Scanner (System.in);
		int num=0;
		while(in.hasNext()) //This checks if there is something to be read. Returns true is there is, false if there isn't.
		{
			num = in.nextInt(); // read the next integer
			if(num % 2 == 0) // print if it is even.
			{
				System.out.println(num);
			}
		}
	}
}