How to display unity ad every 3rd time?

Unity Engine
1

Hi,

I am really new to Unity but impressed with capability of Unity.I have integrated Unity ads to my game and now every time they launch the game it displays.But I need to show ads every 3rd time they launch the game.

I guess this can do for Admob Interstitial ads?

Anyone can me on this?
Thanks in advanced

2

Store an int in PlayerPrefs. Increment it each time the game is launched. If it is > 2, show an ad and set the int to 0.