Оди́н, два, три, четы́ре, пять.
One, two, three, four, five.
IPA /ɐˈdʲin ˈdva ˈtrʲi tɕɪˈtɨrʲə ˈpʲatʲ/
Say it uh-DEEN, DVAH, TREE, chih-TIH-ryuh, PYAT.
один has three gender forms — один (m), одна (f), одно (n) — and they must agree with the noun being counted.