What is the output of this code?

Question

I got this code: https://code.sololearn.com/cMoHerPRibW0/#cpp

Input is stated in the code and its :
12
20
8

and the output I get is 14, but the expected one is 15, can someone explain me where I made mistake here..

Answer 1

Fixed, I didn't round it as it should be. Will update the code later