#include <iostream>

using namespace std;

int main()
{
    int N,c,r,S=0;
    cin>>N;
    do{
        r=N%2;
        if(r==1)
            S++;
        N=N-r;
        c=N/2;
        N=c;
    }while(N);
    cout<<S;
    return 0;
}