#include <iostream>
#include <string>

using namespace std;

int main(){
    int input;
    int counter = 0;
    
    cin >> input;
    
    while(input!=0){
        if(input % 2 == 1){
            counter++;   
        }
        input /= 2;
    }
    
    cout << counter << endl;
    return 0;
}