Given the task definition and input, reply with output. You are given a sentence in Portuguese. Your job is to translate the Portuguese sentence into Farsi.

E a razão para que 21 fosse o número favorito foi que 700 homens partiram, 23 retornaram, dois morreram no barco e 21 chegaram a terra.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
و علت اینکه چرا عدد 21: 700 نفر (به جبهه) رفتن ، 23 نفر بر گشتند. دو نفر هم تو قایق می میرند و تنها 21 نفر به ساحل می رسند.