from turtle import *
import math

def tree(s):
    if s >= 2:
        square(s)
        forward(s)
        s1 = s / math.sqrt(2)
        left(45)
        tree(s1)
        right(90)
        forward(s1)
        tree(s1)
        backward(s1)
        left(45)
        backward(s)

def square(s):
    i = 0
    while i < 4:
        forward(s)
        right(90)
        i += 1

# Corps principal du programme:

left(90)
speed(-1)
tree(100)