#include <iostream>
using namespace std;

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