#include <iostream> 

using namespace std;

/*
 * 
 */
int main() {
    int a, c = 0;
    
    cin >> a;
    
    
    while(a)
    {
        if(a%2 == 1)c++;
        a = a>>1;
    }
    
    cout << c;
    
    return 0;
}