import turtle

#def zeichnen(n):
#    if n > 0:
#        turtle.forward(300)
#        turtle.left(75)
#        turtle.forward(150)
#        turtle.backward(150)
#        zeichnen(n - 1)

#zeichnen(2)

#turtle.mainloop()

#def zeichnen(n):
#   if n == 0:
#        return

#   turtle.forward(100)
#    zeichnen(n - 1)

#turtle.left(90)
#turtle.forward(200)
#turtle.left(45)

#zeichnen(1)

#turtle.backward(100)
#turtle.right(90)

#zeichnen(1)

#turtle.mainloop()


def baum(laenge):
    if laenge < 20:
        return

    turtle.forward(laenge)

    turtle.left(45)
    baum(laenge * 0.5)

    turtle.right(90)
    baum(laenge * 0.5)

    turtle.left(45)
    turtle.backward(laenge)


    turtle.left(90)
    baum(100)

    turtle.mainloop()