[Python] How to design an algorithm to calculate odd or even integer within shortest possible...

Suppose A = 17 is an integer

Now iteration

17- 2 = 15

15 - 2 = 13

13 - 2 = 11

11 - 2 = 9

9 - 2 = 7

7 - 2 = 5

5 - 2 = 3

3 - 2 = 1

Total 8 iteration

How to design an algorithm to calculate odd or even integer within shortest possible iteration. For this case below 8 iterations

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