#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    ifstream fin("bitcount.in");
    ofstream fout("bitcount.out");
    int n, count = 0;
    fin>>n;
    while(n)
    {
            if(n%2 == 1) count++;
            n = n/2;
    }
    cout<<count<<endl;
    system("pause");
    return 0;
}