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:
| Ship | Built | In service for Cunard | Type | Tonnage | Notes |
| --- | --- | --- | --- | --- | --- |
| Queen Mary | 1936 | 1936–1967 | express | 80,750 GRT | Blue Riband, sold 1967, now a stationary hotel ship |
| Mauretania | 1939 | 1939–1965 | express | 37,750 GRT | scrapped 1965 |
| Queen Elizabeth | 1940 | 1946–1968 | express | 83,650 GRT | WWII troopship 1940–1945, sold 1968, destroyed by fire 1972 |
| Media | 1947 | 1947–1961 | cargo liner | 13,350 GRT | sold to Cogedar Line 1961, scrapped 1989 |
| Parthia | 1947 | 1947–1961 | cargo liner | 13,350 GRT | sold to P&O 1961, renamed Remuera, scrapped 1969 |
| Caronia | 1949 | 1949–1968 | cruise | 34,200 GRT | sold 1968, wrecked 1974 |
| Britannic | 1929 | 1950–1960 | intermediate | 26,943 GRT | built for White Star Line, scrapped 1960 |
| Georgic | 1932 | 1950–1956 | intermediate | 27,759 GRT | built for White Star Line, scrapped 1956 |
| Saxonia\nCarmania | 1954 | 1954–1962\n1962–1973 | intermediate\ncruise | 21,637 GRT\n21,370 GRT | Sold to the Black Sea Shipping Company, Soviet Union 1973 |
| Ivernia\nFranconia | 1955 | 1955–1963\n1963–1973 | intermediate\ncruise | 21,800 GRT | Sold to the Far Eastern Shipping Company, Soviet Union 1973, scrapped 2004 |
| Carinthia | 1956 | 1956–1968 | intermediate | 21,800 GRT | sold to Sitmar Line 1968, scrapped 2005 |
| Sylvania | 1957 | 1957–1968 | intermediate | 21,800 GRT | sold to Sitmar Line 1968, scrapped 2004 |
| Alaunia | 1960 | 1960–1969 | cargo liner | 7,004 GRT | sold to Brocklebank Line in 1969 |
| Queen Elizabeth 2 | 1969 | 1969–2008 | express | 70,300 GRT | sold 2008, laid up in Port Rashid |
| Atlantic Causeway | 1969 | 1970–1986 | container ship | 14,950 GRT | scrapped in 1986 |
| Atlantic Conveyor | 1970 | 1970–1982 | container ship | 14,946 GRT | sunk in Falklands War 1982 |
Question:
how many express ships?
Answer:
4