Table:
text: Houston Rockets all-time roster
R
R
Player No_s Height_in_Ft_ Position_ Years_for_Rockets School_Club_Team_Country
Roberts, Stanley Stanley Roberts 53 7-0 Center 1998 LSU
Robinson, Larry Larry Robinson 20 6-3 Guard 1993-94 Centenary
Rogers, Carlos Carlos Rogers 6 6-11 Forward 1999-2001 Tennessee State

Question: What is the total number of players on the Houston Rockets all-time R roster for the Rockets in 1998?