import java.util.Arrays;

public class mc_q13
{
    private static int numbers = {17, 34, 21, 42, 15, 69, 48, 25, 39};

    public static void mystery(int x)
    {
	for ( int k = 1; k < numbers.length; k = k + x )
	    numbers[k] = numbers[k-1] + x;
    }


    public static void main(String[] args)
    {
	System.out.println( Arrays.toString( numbers );
	mystery(3);
	System.out.println( Arrays.toString( numbers );
    }
}