The Greek flag only has two colors

Explanation

Its two colors are blue and white, and it is even nicknamed "the Blue-and-White" (Γαλανόλευκη, Galanólefki) or "the Cyan-and-White" (Κυανόλευκη, Kyanólefki). The design features nine alternating blue and white stripes and a white cross on a blue canton. The cross stands for Eastern Orthodox Christianity, while the nine stripes are said to represent the nine syllables of the Greek motto "Eleftheria i Thanatos" ("Freedom or Death").