import java.awt.*;
import java.awt.event.*;
public class Joonis extends Frame implements ActionListener{
   int nr=8; //algne lindude arv
   TextField tf=new TextField(" "+nr);
   Button nupp=new Button(" LINDU ");
   
   public Joonis(){ //raam
      setLayout(new FlowLayout());
	  add(tf);
	  add(nupp);
	  nupp.addActionListener(this);
	  setSize(300, 300);
	  setVisible(true);
   }
   
   public void paint(Graphics g){ //lindude joonistamine
      g.drawOval(5, 150, 3, 3);
	  for(int i=2; i<nr+1; i++){
	  int k=i/2;
	    if(i==2*k){
	       g.drawOval(5*i, 150-i, 3, 3);//kui paarisarv, siis haar ylesse
		}else{
	       g.drawOval(5*(i-1), 150+i, 3, 3);//kui paarituarv, siis haar alla
		} 
      }
   }
   
   public void actionPerformed(ActionEvent e){
      nr=Integer.parseInt(tf.getText());
	  repaint();
   }
   
   public static void main(String argumendid[]){
      new Joonis();
   }
}