How many olives are in a martini cocktail?

There can be as many olives in a martini cocktail as you like. It’s your cocktail, and you can make it how you want it. However, martini cocktails are often served with three olives, the Dirty Martini Cocktail in particular. This may be because some martini cocktail lovers like to have a salty snack to eat throughout their cocktail, from first sip to last drop.