#include <iostream>

using namespace std;

int main()
{int N,p=1,nq=0;
cin>>N;
while(N!=0)
    {nq=nq+p*(N%2);
    N=N/2;
    p=p*10;
    }
p=0;
while(nq!=0)
    {p=p+(nq%10);
    nq=nq/10;}
cout<<p;
return 0;
}