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:
| Episode number | Original airdate | Title | Disc | Description |
| --- | --- | --- | --- | --- |
| 48 | 30 January 1983 | "The Frozen Turkey Man" | 1 | For a joke, Compo and Clegg convince a barmaid that Foggy is a multi-millionaire. |
| 49 | 6 February 1983 | "The White Man's Grave" | 1 | The trio have Clegg stand in for Wally in an attempt to give Wally a few hours' freedom. |
| 50 | 13 February 1983 | "The Waist Land" | 1 | Foggy attempts to earn some ready cash by smuggling junk food to some health farm inmates. |
| 51 | 20 February 1983 | "Cheering Up Ludovic" | 1 | Clegg is roped in to drive a van when an old friend is too drunk to use it. |
| 52 | 27 February 1983 | "The Three Astaires" | 1 | The trio help out at a church concert, but Compo is more interested in a suit of armour. |
| 53 | 6 March 1983 | "The Arts of Concealment" | 1 | Foggy lands himself in trouble with a group of local cyclists when he demonstrates his supposed skill at camouflage. |
Question:
how many episodes had their original airdate in february?
Answer:
4