Table:
text: Camarines Sur
Geography
Administrative divisions
City_Municipality_0 City_Municipality_1 No_of_Barangays Area_hectares Population_2010 Income_Class_2010 Mayor_2010_2013_
 Nabua 42 9620 80111 1st class Delia C. Simbulan
25px Naga City 27 8448 174931 2nd class John G. Bongat
 Ocampo 25 11833 43523 3rd class Fidel C. Carido
 Pamplona 17 8060 34471 4th class Gimeno A. Imperial
 Pasacao 19 14954 45946 3rd class Asuncion V. Arsenio
 Pili 26 12625 82307 1st class Tomas P. Bongalonta, Jr.
 Presentacion 18 14380 20023 4th class Joey A. Deleña
 Ragay 38 40022 54934 1st class Ricardo B. Aquino
 Sagñay 19 15476 31314 4th class Evelyn B. Fuentebella
 San Fernando 22 7176 33281 4th class Eugenio jun Lagasca, Jr.
 San Jose 29 4307 38523 4th class Antonio B. Chavez

text: Camarines Sur
Geography
Administrative divisions
City_Municipality_0 City_Municipality_1 No_of_Barangays Area_hectares Population_2010 Income_Class_2010 Mayor_2010_2013_
 Baao 30 10663 54971 3rd class Melquiades I. Gaite
 Balatan 17 9309 28699 4th class Ernesto A. Bagasbas
 Bato 33 10712 48306 3rd class Jeanette R. Bernaldez
 Bombon 8 2873 15437 5th class Ma. Luisa DC. Angeles
 Buhi 38 24665 73809 1st class Rey P. Lacoste
 Bula 33 16764 68011 2nd class Benjamin S. Decena
 Cabusao 9 4680 18049 5th class Nebb P. Santiago
 Calabanga 48 16380 78119 1st class Eduardo Severo
 Camaligan 13 468 22254 5th class Marilou Marquez-Hirose
 Canaman 24 4327 32390 4th class Emmanuel S. Requejo
 Caramoan 49 27600 44945 2nd class Constantino H. Cordial, Jr.

text: Camarines Sur
Geography
Administrative divisions
City_Municipality_0 City_Municipality_1 No_of_Barangays Area_hectares Population_2010 Income_Class_2010 Mayor_2010_2013_
 Del Gallego 32 20831 23064 4th class Lydia B. Abarientos
 Gainza 8 1475 10345 5th class William Angeles Abilay
 Garchitorena 23 24380 25204 4th class Solon O.Demetriou Jr.
 Goa 34 20618 58503 2nd class Antero S. Lim
 Iriga City 36 13735 105919 4th class Madeleine A. Gazmen
 Lagonoy 38 37790 51814 2nd class Delfin R. Pilapil Jr.
 Libmanan 75 34282 100002 1st class Marilyn A. Jimenez
 Lupi 38 19912 30118 3rd class Raul M. Matamorosa
 Magarao 15 4497 24274 4th class Salvador A. Senar Jr.
 Milaor 20 3364 28474 4th class Rogelio A. Flores
 Minalabac 25 12610 48162 3rd class Leovegildo D. Basmayor Jr.

text: Camarines Sur
Geography
Administrative divisions
City_Municipality_0 City_Municipality_1 No_of_Barangays Area_hectares Population_2010 Income_Class_2010 Mayor_2010_2013_
 Sipocot 46 24343 64042 1st class Rogenor R. Astor
 Siruma 22 14127 17050 4th class Sandy S. Ondis Sr.
 Tigaon 23 7235 48611 3rd class Arnulf Bryan B. Fuentebella
 Tinambac 44 35162 62435 1st class Ruel T. Velarde

Question: How many mayors of Camarines Sur belonged to the 1st class between 2010 and 2013?