#include <bits/stdc++.h>
using namespace std;
const int maxn = 10000 + 10;
int a[maxn];
int main() {
  int i, j, k, m, n;
  cin >> n;
  int sum = 0;
  while (n > 0) {
    if (n % 8 == 1) sum++;
    n /= 8;
  }
  cout << sum << endl;
  return 0;
}
