// Linnuparv sümmeertiline.

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class Linnud extends Frame implements ActionListener{
  int nr;
  TextField tf=new TextField(" "+nr);
  Button nupp=new Button(" OK ");
  public Linnud(){
    setLayout(new FlowLayout());
    add(tf);
    add(nupp);
    nupp.addActionListener(this);
    setSize(600, 600);
    setVisible(true);
  }
  public void paint(Graphics g){
    int i=1;
	int j=2;
	int k=25;
    int x=30*(10*i);
	int y=100;
    int xx=30*(10*i);
	int yy=100;
	
	  if(nr%2==0){
	    for(; i<=(nr/2); i++){
	    g.drawLine(x, y, x+25, y-10);
	    g.drawLine(x+50, y, x+25, y-10);
	    y=y+50;
		x=x+k;
		  g.drawLine(xx, yy, xx+25, yy-10);
	      g.drawLine(xx+50, yy, xx+25, yy-10);
	      xx=xx-k;
		  yy=yy+50;
	    }
	    } else {
	      for(; i<=(nr/2)+1; i++){
	      g.drawLine(x, y, x+25, y-10);
	      g.drawLine(x+50, y, x+25, y-10);
	      y=y+50;
		  x=x+k;
		   g.drawLine(xx, yy, xx+25, yy-10);
	       g.drawLine(xx+50, yy, xx+25, yy-10);
	       xx=xx-k;
		   yy=yy+50;
	      }
		}
   }
   
  public void actionPerformed(ActionEvent e){
    nr=Integer.parseInt(tf.getText());
    repaint();
  }
  
  public static void main(String argumendid[]){
    new Linnud();
  }
}