using System;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
class Joonis6:Form{
  int px=100, py=100, pr=10;
  protected override void OnMouseDown(MouseEventArgs e){
     base.OnMouseDown(e);
     px=e.X;
     py=e.Y;
     this.Invalidate();
  }
  protected override void OnPaint(PaintEventArgs e){
    base.OnPaint(e);
    Graphics g=e.Graphics;
    g.DrawEllipse(new Pen(Color.Green), px-pr, py-pr, 2*pr, 2*pr);
  }
  public static void Main(string[] arg){
     Application.Run(new Joonis6());   
  }
}