Should I remove my upper wisdom teeth?

[Abram Tai]

Should I remove my upper wisdom teeth?
Two days ago I removed my bottom left wisdom tooth due to infection. I didn't remove my bottom right one because I don't have insurance yet. I'm going to remove the right bottom one within 3 months, when I get insurance.

However, the staff in the dental clinic told me I don't have to remove my upper teeth, just the right bottom one. I'm not sure if it's true? Because I don't wanna go through this three times..

My X ray picture : http://imgur.com/vZTwXKn

Thanks !