SB 9.6.43
munih pravesitah ksatra
kanyantahpuram rddhimat
vrtah sa raja-kanyabhir
ekam pañcasata varah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter, when Saubhari Muni became quite a young and beautiful person, the messenger of the palace took him inside the residential quarters of the princesses, which were extremely opulent. All fifty princesses then accepted him as their husband, although he was only one man.