Write a method that takes in a positive integer, return the number of 2s between 0 and the input number.
If the input value given is 13, it should return 2 as the number 2 and 12 are between 0 and 13.
If the input value given is 21, it should return 3 as the number 2,12 and 20 are between 0 and 21.
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