yīréndédào,jīquǎnshēngtiān

Traditional: 一人得道，雞犬升天

lit. when a man achieves the Dao, his poultry and dogs rise to Heaven (idiom) / fig. to ride on sb else's success / Once one man gets a government position, all his cronies get in too / Once sb has cracked the problem, every Tom, Dick and Harry can do it