Passage:  First of all, I need work, and a decent wage for my work. Aristotle defined happiness. not as a sum of pleasures, but as unimpeded activity. I want work which is hard but interesting. I am exceptionally lucky because I can choose my own work to a large extent. If I want respite from science I can go and be a war correspondent, or write children's stories or make political speeches.
 I require friendship. Particularly I require friendship of my colleagues and comrades in scientific and political work. I want the society of equals who will criticize me, and whom I can criticize.

Q:

Conjunction in sentence 3 is 

• 1
  want
• 2
  hard
• 3
  but
• 4
  interesting