How many olives are in a martini cocktail?

Martini cocktails are often served with three olives, especially when ordering a Dirty Martini Cocktail. If you're the superstitious type, you may want to know that tradition states that serving olives in even numbers is bad luck. So one or three olives are great, but two? Not so much. Also, many martini cocktail lovers like to have a salty snack to eat throughout their cocktail, from first sip to last drop. However, it’s your cocktail, and you can make it with as many olives as you like.