include <bits/stdc++.h>

using namespace std;

int main() {

stack<long long>a;
long long ans = 0, n;
cin >> n;
while (n >= 2) {
	a.push(n % 2);
	n /= 2;
}
a.push(n);
while (a.empty() == 0) {
	if (a.top() == 1)
		ans++;
	a.pop();
}
cout << ans << endl;
return 0;

}