from turtle import *
def nol (x) :
    down()
    forward(45)
    left(90)
    forward(100)
    left(90)
    forward(45)
    left(90)
    forward(100)
    left(90)
    up()
    forward(45)
def ed (x) :
    down
    left(90)
    forward(100)
    left(135)
    fd(50*2**0.5)
    up()
    right(-90)
    fd(50*2**0.5)
    left(45)
 
 up()
 forward(-200)
 for i in range (3) :
     ed(15)
     forward(50)
     nol(15)
     fd(70)