Parque Batlle (formerly: Parque de los Aliados, translation: "Park of the Allies") is a major public central park, located south of Avenida Italia and north of Avenue Rivera. Along with Parque Prado and Parque Rodó it is one of three large parks that dominate Montevideo. The park and surrounding area constitute one of the 62 neighbourhoods (barrios) of the city. The barrio of Parque Batlle is one of seven coastal barrios, the others being Buceo, Carrasco, Malvin, Pocitos, Punta Carretas, and Punta Gorda. The current barrio of Parque Battle includes four former districts: Belgrano, Italiano, Villa Dolores and Batlle Park itself and borders the neighbourhoods of La Blanqueada, Tres Cruces, Pocitos and Buceo. It has a high population density and most of its households are of medium-high- or high-income. Villa Dolores, a subdistrict of Parque Batlle, took its name from the original villa of Don Alejo Rossell y Rius and of Doña Dolores Pereira de Rossel. On their grounds, they started a private collection of animals that became a zoological garden and was passed to the city in 1919; in 1955 the Planetarium of Montevideo was built within its premises.
How many former districts does the current barrio of Parque Battle include? 
four