clear()
setFillColor(blue)
setSpeed(fast)
setPenColor(black)
setBackground(gray)
circle(10)
circle(20)
circle(30)
circle(40)
circle(50)
circle(60)
circle(70)
circle(80)
circle(90)
circle(100)
circle(110)
circle(120)
circle(130)
circle(140)
circle(150)
circle(160)
circle(160)
circle(170)
circle(180)
circle(190)
circle(200)
circle(210)
circle(220)
circle(230)
circle(240)
circle(250)
circle(260)
circle(270)
circle(280)
circle(290)
circle(300)