#include <iostream>

using namespace std;

int main()
{
    int n;
    int mask=1;
    int s=0,intermediar;
    cin>>n;
    for(int i=1;i<=4;i++)
    {
    intermediar=(mask<<(i-1))&n;
    if(intermediar!=0)
    s+=1;
    }
    cout<<s;
    return 0;
}