#include <iostream>
using namespace std;

int main() {
    int a;
    int sum = 0;
    cin >> a;
    while (a > 0)
    {
        int temp = 0;
        temp = a % 2;
        if (temp == 1)
            sum += 1;
        a /= 2;
    }
    cout << sum;
}
// 64 位输出请用 printf("%lld")