import java.util.*;
import java.lang.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;


class Main
{
  public static void main (String[] args) throws java.lang.Exception {	

    int width = 100;
    int height = 100;
    BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

    Graphics2D g = bufferedImage.createGraphics();
    g.setColor(Color.white);
    g.fillRect(0, 0, width, height);
    g.setColor(Color.black);
    g.fillOval(0, 0, width, height);

    
    ImageIO.write(bufferedImage, "png", System.out);
  }	
}