import turtle
import math

sw=turtle.Turtle()
wn = turtle.Screen()
sw.speed(0)

def draw(lenght, n):
    if n == 0:
        return
    elif n == 1:
        sw.forward(lenght)
    else:
        angle = 60
        draw(lenght, n-1)
        sw.right(angle)
        draw(lenght, n-1)
        sw.left(2*angle)
        draw(lenght, n-1)
        sw.right(angle)
        draw(lenght, n-1)

def koch(lenght, n):
    draw(lenght, n)
    sw.left(120)
    draw(lenght, n)
    sw.left(120)
    draw(lenght, n)