#include <iostream>

using namespace std;

long long a, p;

int main() {
    cin >> a;

    long long answer = 0;

    for(long long p = 0; (1 << p) <= a; ++p) {
        if((1 << p) & a) {
            ++answer;
        }
    }

    cout << answer << '\n';

    return 0;
}