A Kaboobly Dooist gives you 8 coins.

He tells you that **exactly one** of the 8 coins is counterfeit and that the counterfeit coin is **heavier**.

He then gives you a beam balance and an User Manual. You have never seen a beam balance before, so you open the user manual and find that it says:

You can place a coin or a group of coins on the two pans of the balance. You can find which side is heavier, if any or if their weights are equal.

What is the *minimum* number of times you need to use the balance to *surely* find the counterfeit coin?

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