#include <iostream>
using namespace std;

int count1(int n){
    int count = 0;
    while(n/2 || n%2){
        if(n % 2 == 1) count++;
        n /= 2;
    }

    return count;
}

int main() {
    int n;
    cin >> n;

    cout << count1(n) << endl;
    return 0;
}
// 64 位输出请用 printf("%lld")