#include <bits/stdc++.h>
using namespace std;
int n, i = 1, ans = 0;
int main() {
  cin >> n;
  while (n > 0) {
    if (n % 2 == 1) {
      ans++;
      n -= 1;
    }
    n /= 2;
  }
  cout << ans << endl;
}
