hayai mono gachi
people who come early win
First come, first served
It sounds slightly childish compared to its synonym, 先着順 (せんちゃくじゅん), meaning “first-arrive order”. Its near-antonym is a proverb 残り物には福がある, meaning “a fortune is in the remnants”; a similar concept to “good things come to those who wait”.
If you want chocolates, please come here! First come, first served!