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

public class Grisaille extends Color{

	public Grisaille(int val){
		super(val, val, val);
	}

	public static void main(String[] args) {
		if (args.length <= 0){
			System.err.println("args missing");
			System.exit(1);
		} Integer arg = Integer.parseInt(args[0], 10);
		JFrame fenetre = new JFrame();
		fenetre.setSize(400, 200);
    	fenetre.setLocation(0, 0);
    	fenetre.setVisible(true);
    	JPanel panel = new JPanel();
    	panel.setBackground(new Grisaille(arg));
    	fenetre.add(panel);
    	fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}