public class CountingDriver {
    public static final int FIRST = 0;
    public static final int LAST = 50;

    public static void count(int current) {
        if (current <= LAST) {
            System.out.println(current);
            count(current+2);
        }
    }

    public static void main(String [] args) {
        int current = FIRST;
        count(current);
    }
}