#include<cstdio>
#include<cstring>
#include<iostream>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<map>
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
const int MR=1e6+10;

int s2(ULL x){
    int sum=0;
    while(x){
        sum+=x&1;
        x>>=1;
    }
    return sum;
}

int main(){
    ULL n;
    cin>>n;
    cout<<s2(n)<<endl;
    return 0;
}