Step 8 (S-13535)

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Step on Stepik: https://stepik.org/lesson/3372/step/8

S-13535-1.png


Sample Input 1:

4.5

Sample Output 1:

7.25


Sample Input 2:

-4.5

Sample Output 2:

-5.25


Sample Input 3:

1

Sample Output 3:

-0.5