int x,y=0;

void setup()
{
size(400,300); 
smooth();
frameRate(10);
}

void draw()
{

  background(#cbcefb);
  noFill();
  strokeWeight (10); 

  stroke (0,0,255); 
  ellipse (80,100,100,100);

  stroke (0,0,0); 
  ellipse (195,100,100,100);

  stroke (255,0,0);
  if(x==310||y==100)
  {
    ellipse (310,100,100,100); 
  }
  else
  {
    x=(int) random(400);
    y=(int) random(300);
    ellipse (x, y,100,100); 
  }
  
  stroke (255,255,0); 
  ellipse (138,160,100,100);

  stroke (0,255,0); 
  ellipse (253,160,100,100);

}