Who knows three hundred and four?
?ארבעה ושלוש מאות - מי יודע
In the spirit of the song "Echad - mi yodeya", please post interesting and significant Jewish facts about the number 304.
It could be devilishly hard, perhaps even more like actual work than squeezing out toothpaste, to come up with something from the lazy gematria here.
Check out mi-yodeya-series for the previous three hundred and three entries in this ongoing series.
Please include sources for your information wherever possible, as with all other answers on this site.