#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int countBits(int n) {

int setBit = 0;

while (n != 0) {

if (n & 1) {

setBit++;

}

n >>= 1;

}

return setBit;

}

int main() {

int n;

cin >> n;

cout << countBits(n);

return 0;

}