#include<bits/stdc++.h>
 using namespace std;
#define INF 1000000000
#define REP(i,n) for(int (i)=0;(i)<(int)(n);(i)++)

typedef long long ll;
ll N;
int main(){
    cin>>N;
    ll ans=0;
    while(1){
       if(N==0)break;
       if(N%2==1)ans++;
       N/=2;
    }
    cout<<ans<<endl;
}