import turtle
tracer(0)
screensize (1000,1000)
c=20
left(90)
for i in range (7):
  fd(10*c)
  rt(120)
up()
for x in range (-20,20):
  for y in range (-20,30):
    goto(x*c,y*c)
    dot(3, 'blue')
    
update()
exitonclick()