Binary Numbers

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Calculate and return number of 1s in binary representation of given number n.

Input format :
Integer n
Output Format :
In one line print the total number of 1s which satisfy above description
Constraints :

1 <= n <= 2^63 - 1

Sample Input :
 4
Sample Output :
 1
Sample Input Explanation :

4 can be represented as 100 in binary, which has only one 1 in binary representation.

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