What is the lucky value of qq flyer fountain getting crystal?

In this game, after the lucky value of the wishing pool reaches 800, you can get the crystal.

In the game "qq Speeding", there is an activity called the wishing pool. Players can make a wish by consuming coupons or diamonds, and get possible permanent vehicles and items. When a player makes a wish once, it will increase the lucky value. The higher the lucky value, the greater the probability of obtaining permanent items. When the lucky value reaches 800, you must make a wishing crystal.