Fun with Bits

Macron is a small boy lived happy with his friends and family in chocoworld. He always wanted to do degree in Applepie University. But to do that , he needs to give an entrance test. There is only one question in the test. You have to help Macron to solve that question. You are given a positive integer $N$, and you have to count the total number of set bits in binary representation of all numbe