Valmiki Ramayana Kishkindha Kanda Sarga 39 Shloka 21

पनसो नाम Panasa by name, महावीर्यः a great warrior, यूथपः troop leader, तिसृभिः कोटिभिः by three crores, महाचलनिभैः by those resembling huge mountains, घोरैः by a dreadful one, वृतः surrounded by, आजगाम came.

Similarly, the great warrior named Panasa, leader of the troop, reported with three crore dreadful vanaras of the size of huge mountains.