#include<iostream>
#include<sstream>
#include<bitset>
using namespace std;

int main(){
    int n;
    cin>>n;
    stringstream ss;
    ss<< bitset<100> (n);
    string s=ss.str();

    int count=0;
    for(int i=0;i<s.size();i++)
        if(s[i]=='1')
            count++;

    cout<<count;

    return 0;
}