Who among the following lives on the bottom most floor?

S lives on the floor which is a prime number but not on the 3rd floor. P lives on the topmost floor. W lives immediately above the floor on which R lives but not on an even numbered floor. There is one person living between the floors on which W and S lives. In CASE1 W live in even floor so CASE1 is cancelled out. The person lives between P and R is not more than three and not less than two. In CASE2A and CASE2B the person lives between P and R is more than three and less than two. So, CASE2A and CASE2B is cancelled out. Z lives immediately above the floor on which Q lives. X lives immediately below the floor on which Q lives