Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Seniors (Trood Award & Rodda Medal) | Reserves (Rex Hartley Medal) | Under 18's (Bruce Wilkinson Medal) | Under 16's (Shaw/Carter Medal) |
| --- | --- | --- | --- | --- |
| 1954 | Bob Mason (Sale) (20 Votes) | Rex Donnelly (Moe) (19) |  |  |
| 1955 | Bob Mason (Sale) (23) | Ron Hayes (Warragul) (20) |  |  |
| 1956 | Noel Alford (Traralgon) (18) | "Mossy" Morgan (Trafalgar) (33) |  |  |
| 1957 | John Nix (Sale) (21) | "Mossy" Morgan (Trafalgar) (16) | M.James (Morwell) (19) |  |
| 1958 | Lester Ross (Moe) (31) | Tom Hart (Sale) (33) | M.West (Warragul) (14) |  |
| 1959 | Peter Bevilacqua (Yarragon) (19) | Ray Pollock (Yallourn) | N.Hall (Yallourn) (12) |  |
| 1960 | Steve Szabo (Morwell) (20) | Allan Rankin (Trafalgar) (20) | G.Townsend (St Pat's) (22) |  |
| 1961 | Kevin Coverdale (Bairnsdale) (24) | Jack Vinall (Yallourn) (20) | G.Townsend (St Pat's) (31) |  |
| 1962 | Ric Belford (Yallourn) (27) | Tom O'Callaghan (Traralgon) (18) | T.Hunter (Traralgon) (29) |  |
| 1963 | Allan Steele (Moe) (18) | Ron Serong (Warragul) (32) | R.Foster (St Pat's A) (35) | WEST ZONE (Under 18's) |
| 1964 | Mike Collins (Yallourn) (17) | Max Prendergast (Bairnsdale) (27) | J.Barnett (Sale) (23) | B.Pickering (Trar. Colts) (12) |
| 1965 | Steve Szabo (Morwell) (26) | Richard Evans (Maffra) (20) | J.Barnett (Sale) (25) | P.Lerstang (Traraglon Colts) (23) |
| 1966 | Terry Hunter (Traralgon) (15) | Les Roberts (Sale) (21) | G.Fletcher (St Pat's) (20) | C.Luxford (Morwell) (18) |
| 1967 | George Brayshaw (Traralgon) (15) | Les Roberts (Sale) (12) | D.Scott (Heyfield) (23) | R.Baldry (Warragul) (12) |
| 1968 | Les Hawken (Trafalgar) (31) | Peter Rodaughan (Moe) (28) | J.Welsh (St Pat's) (30) | E.Gray (Trar. Colts) (25) |
| 1969 | John Gallus (Bairnsdale) (37) | Barry Taylor (Yallourn) (14) | P.Speed (Sale) (22) | M.Mancuso (Traralgon) (11) |
| 1970 | John Gallus (Maffra) (30) | Lyle Berry (Heyfield) (18) | A.Gallagher (St Pat's) (27) | G.McFarlane (Morwell) (13) |
| 1971 | Terry Benton (Leongatha) (20) | Graeme Anderson (Heyfield) (18) | I.Stanley (Traralgon) (19) | P.Shields (Moe) (15) |
| 1972 | Henro Kornacki (Morwell) (27) | Barry Taylor (Yallourn) (13) | T.Munro (Traralgon) (23) | L.Ponton (Trar. Colts) (18) |
| 1973 | Barry Rowlings (Moe) (35) | Jack Vardy (Maffra) (21) | A.Williams (Traralgon) (19) | C.Carr (Morwell) (18) |
| 1974 | Barry Rowlings (Moe) (28) | Gus Eaton (Moe) (20) | J.Buntine (Sale) (24) | S.McNamara (Leongatha) (15) |
| 1975 | John Gallus (Warragul) (28) | Peter Pacunskis (Traralgon) (15) | P.Boyce (Moe) (20) |  |
| 1976 | Ray Christine (Bairnsdale) (19) | Jack Vardy (Maffra) (17) | J.Morrison (St Pat's) (25) |  |
| 1977 | Peter Hall (Traralgon) (14) | Jack Vardy (Maffra) (14) | C.Dowd (Leongatha) |  |
| 1978 | Jeff Mogel (Morwell) (22) | John Kimberley (Yallourn) (18) | W.McInnes (Yallourn) (25) |  |
| 1979 | Jeff Gieschen (Maffra) (22) | Allan Light (Warragul) (24) | A.Morrison (Warragul) (24) |  |
| 1980 | Ian Salmon (Leongatha) (24) | Jeff Swenson (Newborough) (24) | R.Copeland (Morwell) |  |
| 1981 | Ray Mildenhall (Yallorn/YNth) (24) | Jock Eason (Moe) (15) | M.Trewella (Warragul) (27) |  |
| 1982 | Jeff Gieschen (Maffra) (27) | Kasey Plemper (Moe) (17) | G.Scott (Bairnsdale) (27) |  |
|  | David Vogel (Morwell) (27) |  |  |  |
| 1983 | Ray Mildenhall (Yallorn/YNth) (24) | Greg Roughead (Leongatha) (27) | C.Dilettoso (Maffra) (33) |  |
| 1984 | Peter Hall (Traralgon) (27) | Gary House (TTU) (17) | G.Rankin (Warragul) (22) |  |
| 1985 | Rod Kerr (Morwell) (30) |  |  |  |
Question:
what is the number of rex hartley medal for bob mason 1955
Answer:
20