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:
| No | Driver | Entrant | Constructor | Chassis | Engine | Tyre |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | Johnny Claes | Ecurie Belge | Talbot-Lago | Talbot-Lago T26C-DA | Talbot 23CV 4.5 L6 | D |
| 4 | Philippe Étancelin | Philippe Étancelin | Talbot-Lago | Talbot-Lago T26C-DA | Talbot 23CV 4.5 L6 | D |
| 6 | Yves Giraud-Cabantous | Yves Giraud-Cabantous | Talbot-Lago | Talbot-Lago T26C | Talbot 23CV 4.5 L6 | D |
| 8 | Louis Rosier | Ecurie Rosier | Talbot-Lago | Talbot-Lago T26C-DA | Talbot 23CV 4.5 L6 | D |
| 10 | Henri Louveau | Ecurie Rosier | Talbot-Lago | Talbot-Lago T26C | Talbot 23CV 4.5 L6 | D |
| 12 | George Abecassis | HW Motors | HWM-Alta | HWM 51 | Alta 1.5 L4s | D |
| 14 | Stirling Moss | HW Motors | HWM-Alta | HWM 51 | Alta 1.5 L4s | D |
| 16 | Peter Whitehead | Scuderia Ferrari | Ferrari | Ferrari 125 | Ferrari 125 F1 1.5 V12s | D |
| 18 | Luigi Villoresi | Scuderia Ferrari | Ferrari | Ferrari 375 | Ferrari Type 375 4.5 V12 | P |
| 20 | Alberto Ascari | Scuderia Ferrari | Ferrari | Ferrari 375 | Ferrari Type 375 4.5 V12 | P |
| 22 | Nino Farina | Alfa Romeo SpA | Alfa Romeo | Alfa Romeo 159A | Alfa Romeo 1.5 L8s | P |
| 24 | Juan Manuel Fangio | Alfa Romeo SpA | Alfa Romeo | Alfa Romeo 159A | Alfa Romeo 1.5 L8s | P |
| 26 | Toulo de Graffenried | Alfa Romeo SpA | Alfa Romeo | Alfa Romeo 159A | Alfa Romeo 1.5 L8s | P |
| 28 | Consalvo Sanesi | Alfa Romeo SpA | Alfa Romeo | Alfa Romeo 159 | Alfa Romeo 1.5 L8s | P |
| 30 | Louis Chiron | Enrico Platé | Maserati | Maserati 4CLT-48 | Maserati 4 CL 1.5 L4s | P |
| 32 | Harry Schell | Enrico Platé | Maserati | Maserati 4CLT-48 | Maserati 4 CL 1.5 L4s | P |
| 38 | Rudi Fischer | Ecurie Espadon | Ferrari | Ferrari 212 | Ferrari Type 375 4.5 V12 | P |
| 40 | Guy Mairesse | Yves Giraud-Cabantous | Talbot-Lago | Talbot-Lago T26C | Talbot 23CV 4.5 L6 | D |
| 42 | José Froilán González | José Froilán González | Talbot-Lago | Talbot-Lago T26C-GS | Talbot 23CV 4.5 L6 | D |
| 44 | Piero Taruffi | Scuderia Ferrari | Ferrari | Ferrari 375 | Ferrari Type 375 4.5 V12 | P |
| 46 | Francis Rochat | Francis Rochat | Simca-Gordini | Simca-Gordini T11 | Simca-Gordini 15C 1.5 L4s | E |
| 48 | Maurice Trintignant | Equipe Gordini | Simca-Gordini | Simca-Gordini T15 | Simca-Gordini 15C 1.5 L4s | E |
| 50 | André Simon | Equipe Gordini | Simca-Gordini | Simca-Gordini T15 | Simca-Gordini 15C 1.5 L4s | E |
| 52 | Peter Hirt | Peter Hirt | Veritas | Veritas Meteor | Veritas 2.0 L6 | ? |
Question:
how many drivers used maserati as their constructor?
Answer:
2