#include <iostream>
#include <fstream>
#include <math.h>
#include <cmath>
//#include <gmpxx.h>


using namespace std;

#define dimen 1001

int n=0,no=0;

int main(){
    #ifndef ONLINE_JUDGE
        freopen("test.in", "r", stdin);
        //freopen("test.out", "w", stdout);
    #endif
    cin >> n;
    while (n>0){
            if (n%2 == 1){
                no++;
            }
            n = n/2;
    }
    cout << no << endl;
}