import java.util.Scanner;
//Parse String

class Program01 {
    public static void main(String[] args) {
        Scanner scanner =  new Scanner("1 2 3 4 5 6 7 8 9 10");

        while (scanner.hasNextInt()) {
            int num = scanner.nextInt();

            if (num % 2 == 0)
                System.out.println(num);
        }
    }
}