#include <iostream>
#include <string>
#include <bitset>
using namespace std;
int main()
{
int n; cin >> n;
std::string result = std::bitset<32>(n).to_string();
int total = 0;
for(int i = 0; i < result.size(); i++)
if(result[i] == '1')
total++;
cout << total << endl;
}