#include<iostream>
using namespace std;

class Solution {
public:

    int ham(int n) {
        int result = 0;

        while (n>0) {
            if (n % 2 == 1)
                result++;
            n = n / 2;
        }

        return result;
    }
};


int main() {
    Solution solution;
    
    cout << solution.ham(15);

    return 0;
}