"one, two, three, four, five"
Translation:unu, doi, trei, patru, cinci
Unu and una are used without a noun (it's similar to 'this one' in English - like, you don't have to name the thing itself, you can just say unu/una), unu for masculin and una for feminin. As for the rest - un and doi are one and two for masculin nouns, o and două are one and two for feminin nouns. Probably not relevant for you now, but maybe will be for others.