selenium, webdriver - can't find - xpath/css_selector/... python

somebody can upload code of clicking the checkbox in this page IN PYTHON ONLY- http://ift.tt/1AcNpMS

i cant find the xpath for this code ...

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException

driver1 = webdriver.Firefox()
driver1.get("http://ift.tt/1AcNpMS")
driver1.find_element_by_xpath(...).click()