import javax.swing.*;
import java.awt.*;
import java.awt.Color;

public class Damier {
  public static void main(String[] args) {
    Color blanc = new Color(255,255,255);
    Color cyan = new Color(0,255,255);
    int l = Integer.parseInt(args[0]);
    System.out.println(l);
    JFrame fenetre = new JFrame();
    fenetre.setSize(500, 500);
    fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    GridLayout gestionnaire = new GridLayout(l, l);
    fenetre.setLayout(gestionnaire);
    for (int i=0; i<(l*l); i++){
      JTextField block = new JTextField(" ");
      if (i % 2 == 0)
        block.setBackground(blanc);
      else
        block.setBackground(cyan);
      fenetre.add(block);
    }
    fenetre.setVisible(true);
  }
}