Brain Test All-Star Level 136 I bet you can’t solve this

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By Emir Lajev /
Question
I bet you can’t solve this.
Hints
Hint 1:
Count the circles.
Step 1
Answer
The answer is equal to the holes of the digits. For example (3338 = 2) because 8 has two holes and 3 has no hole. So, the answer for 6868 would be 6.