#!/usr/bin/python

from turtle import *
from time import sleep 

def carre( n ):
    for i in range( 0, 4 ):
        forward( n )
        left( 90 )

def figure( nb, lg, diff ):
    for i in range( 0, nb ):
        carre( lg )
        lg += diff

if __name__ == "__main__":
    figure( 5, 30, 20 )
    sleep( 3 )