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:
| Race Name | Circuit | Date | Winning driver | Constructor | Report |
| --- | --- | --- | --- | --- | --- |
| II Lombank Trophy | Snetterton | 26 March | Jack Brabham | Cooper - Climax | Report |
| IX Glover Trophy | Goodwood | 3 April | John Surtees | Cooper - Climax | Report |
| XXI Pau Grand Prix | Pau | 3 April | Jim Clark | Lotus - Climax | Report |
| III Brussels Grand Prix | Heysel | 9 April | Jack Brabham | Cooper - Climax | Report |
| II Vienna Grand Prix | Aspern Aerodrome | 16 April | Stirling Moss | Lotus - Climax | Report |
| VI Aintree 200 | Aintree | 22 April | Jack Brabham | Cooper - Climax | Report |
| XI Syracuse Grand Prix | Syracuse | 25 April | Giancarlo Baghetti | Ferrari | Report |
| XIX Naples Grand Prix | Posillipo | 14 May | Giancarlo Baghetti | Ferrari | Report |
| IX London Trophy | Crystal Palace | 23 May | Roy Salvadori | Cooper - Climax | Report |
| VI Silver City Trophy | Brands Hatch | 3 June | Stirling Moss | Lotus - Climax | Report |
| Solitude Grand Prix | Solitudering | 23 July | Innes Ireland | Lotus - Climax | Report |
| VII Kanonloppet | Karlskoga | 20 August | Stirling Moss | Lotus - Climax | Report |
| II Danish Grand Prix | Roskildering | 26–27 August | Stirling Moss | Lotus - Climax | Report |
| XV Modena Grand Prix | Modena | 3 September | Stirling Moss | Lotus - Climax | Report |
| III Flugplatzrennen | Zeltweg Airfield | 17 September | Innes Ireland | Lotus - Climax | Report |
| VIII Gold Cup | Oulton Park | 23 September | Stirling Moss | Ferguson - Climax | Report |
| V Lewis-Evans Trophy | Brands Hatch | 1 October | Tony Marsh | BRM - Climax | Report |
| I Coppa Italia | Vallelunga | 12 October | Giancarlo Baghetti | Porsche | Report |
| V Rand Grand Prix | Kyalami | 9 December | Jim Clark | Lotus - Climax | Report |
| I Natal Grand Prix | Westmead | 17 December | Jim Clark | Lotus - Climax | Report |
Question:
What is the total amount of circuts dated 22 april?
Answer:
1.0