I read somewhere that programmers should learn a new programming language every year (I think it’s code complete, not sure, though), but if you cannot do so, I suggest you at least learn the following five programming languages to do well in your career.
Every company loves polyglot programmers and a well-rounded coder, who is versatile enough languages to write a quick script, and can also write complex Java programs, is a valuable coder indeed. In fact, it’s almost mandatory for a senior developer to learn more than one language.