#include <iostream>

using namespace std;

int k;

int main()
{
    int n,i,j,p;
    cin>>n;
    for (i=5;i>=0;--i)
    {
        p=1;
        for (j=1;j<=i;++j)
            p*=2;
        if (p<=n) {k++;n-=p;}
    }
    cout<<k;
    return 0;
}