Petals Around the Rose

Petals Around the Rose is a mathematical puzzle in which your objective is to work out the formula by which a number is derived from the roll of a set of five dice.

Three things you should know:

1. The name of the game is significant.

2. The number of petals is always a zero or an even number.

3. You can see result number for any dice roll.

Your task is to figure out the rule for determining the number of petals and thus become a Potentate of the Rose.

Have fun!