#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  int x, ans = 0;
  cin >> x;
  while (x) {
    if (x & 1) ans++;
    x >>= 1;
  }
  cout << ans << endl;
}
