#include <iostream>
#include <string>
#include <bitset>
using namespace std;

int main(){
    int n;
    cin>>n;
    bitset<32> bit(n);
    string binary = bit.to_string();
    int count = 0;
    for(char i : binary){
        if(i=='1'){
            count++;
        }
    }
    cout<<count;
}