One day Einstein  is walking in a street in New York . His friend meets him and says to him, "Einstein, you should buy a new coat. Look, your coat is very old." But Einstein answers, "It doesn't matter . Nobody knows me here." After a few years, Einstein becomes a famous scientist  . But he still  wears the old coat. His friend meets him again and asks him to buy a new one. But Einstein says, "I don't need to buy a new one. Everyone knows me here." Einstein doesn't want to buy a new one because    _  .
nobody knows him he likes the old one he has no money he isn't interested in his clothes