#include <iostream>
#include <vector>
#include <set>
#include <cstring>
using namespace std;

int main() {
    int n;
    cin >> n;

    int bitovi = 0;
    while(n > 0) {
        if(n % 2 == 1) {
            bitovi++;
        }
        n /= 2;
    }
    cout << bitovi << endl;
    return 0;
}