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:
| Name | Elected Party | Constituency | Elected date | Military service |
| --- | --- | --- | --- | --- |
| John Pallett | Progressive Conservative | Peel | March 22, 1954 | Canadian Army (1942-1946) |
| Roger Parizeau | Progressive Conservative | Lac-Saint-Jean | March 31, 1958 | Canadian Army (1939-1945) |
| William Albert Patterson | Conservative | Colchester | March 5, 1891 | Militia |
| William Hector Payne | Progressive Conservative | Coast—Capilano | March 31, 1958 | Canadian Army (1941-1945) |
| George Randolph Pearkes | Progressive Conservative | Nanaimo | June 11, 1945 | Canadian Army (1915-1945) |
| Lester Bowles Pearson | Liberal | Algoma East | October 25, 1948 | Canadian Army (1914-1917), Royal Flying Corps (1917-1918) |
| Cyrus Wesley Peck | Unionist | Skeena | December 17, 1917 | Canadian Army (1914-1925) |
| Charles Alphonse Pantaléon Pelletier | Liberal | Kamouraska | February 17, 1869 | Militia |
| Irénée Pelletier | Liberal | Sherbrooke | October 30, 1972 | Royal Canadian Air Force (1960-1962) |
| Louis-Philippe Pelletier | Conservative | Quebec County | September 21, 1911 | Militia |
| Lawrence T. Pennell | Liberal | Brant—Haldimand | June 18, 1962 | Royal Canadian Air Force |
| Robert Pennock | Progressive Conservative | Etobicoke North | September 4, 1984 | Canadian Army (1951-1952), Royal Canadian Navy (1954-1968) |
| Arnold Peters | Cooperative Commonwealth Federation | Timiskaming | June 10, 1957 | Royal Canadian Air Force (1942-1945) |
| Orville H. Phillips | Progressive Conservative | Prince | June 10, 1957 | Royal Canadian Air Force (1942-1945) |
| Elmore Philpott | Liberal | Vancouver South | August 10, 1953 | Canadian Army (1915-1919) |
| Bernard Pilon | Liberal | Chambly—Rouville | June 18, 1962 | Canadian Army (1941-1945) |
| Alfred Pinsonneault | Conservative | Laprairie | September 20, 1867 | Militia (1855-1862) |
| D'Arcy Britton Plunkett | Conservative | Victoria | December 6, 1928 | Royal Flying Corps |
| William Albert Pommer | Liberal | Lisgar | August 10, 1953 | Canadian Army |
| John Henry Pope | Liberal-Conservative | Compton | September 20, 1867 | Militia |
| John Poupore | Conservative | Pontiac | September 17, 1878 | Militia (1869-) |
| Charles Gavan Power | Liberal | Quebec South | December 17, 1917 | Canadian Army (1915-1918) |
| Francis "Frank" Gavan Power | Liberal | Quebec South | September 26, 1955 | Canadian Army |
| Russ Powers | Liberal | Ancaster--Dundas--Flamborough--Westdale | June 28, 2004 | Canadian Forces Land Force Command |
| Robert John Pratt | Progressive Conservative | Jacques Cartier—Lasalle | June 10, 1957 | Canadian Army (-1942), Royal Canadian Navy (-1946) |
| David Price | Progressive Conservative | Compton—Stanstead | June 2, 1997 | Canadian Army (1959-1965) |
| William Price | Conservative | Quebec West | October 26, 1908 | Canadian Army |
| Edward Gawler Prior | Conservative | Victoria | January 23, 1888 | Canadian Army |
| Robert William Prittie | New Democratic | Burnaby—Richmond | June 18, 1962 | Royal Canadian Air Force (1938-1945) |
| John Oliver Probe | Cooperative Commonwealth Federation | Regina City | June 11, 1945 | Canadian Army (1941-1944) |
| David Vaughan Pugh | Progressive Conservative | Okanagan Boundary | March 31, 1958 | Canadian Army |
Question:
how many people served in the canadian army?
Answer:
18