//
// See ../README.md
//

//
// Run as: ln ch-1.java ch1.java; javac ch1; java ch1
//

public class ch1 {
    public static void main (String [] args) {
        System . out . print ("0, 0, 0, 2, 0, 5, 0, 6, 3, 7, 0, 15, 0, 9, 8, 14, 0, 20, 0, 21\n");
    }
}