#include <iostream>
using namespace std;
 
 
int NumberOfSetBits(int n)
{
    int count = 0;
 
    while (n)
    {
        ++ count;
        n = (n - 1) & n;
    }
 
    return count;
}
 
int main() {
int N ;
cin >> N ;
cout << NumberOfSetBits(N) ; 
	return 0;
}