#include <cstdio>

using namespace std;

int main()
{   //freopen("input","r",stdin);
    //freopen("output","w",stdout);
    int a,sol=0;
    scanf("%d",&a);

    while(a)
    {
        if(a%2==1) sol++;
        a/=2;
    }
    printf("%d",sol);
}