import java.io.*;
import java.util.*;

public class Main {
    static PrintWriter sout = new PrintWriter(System.out);
    static FastReader sc = new FastReader();

    public static void main(String[] args) {
       int n = sc.nextInt();
       int cnt = 0;
       for (; n>0; n-=lowbit(n)) 
           cnt++;

       sout.print(cnt);
       sout.close();
    }
    
    public static int lowbit(int x) {
        return x&-x;
    }
    
}

class FastReader{
    StringTokenizer st;
    BufferedReader br;
    public FastReader(){
        br = new BufferedReader(new InputStreamReader(System.in));
    }
    
    public boolean hasNextInt() {
        while (st == null || !st.hasMoreElements()) {
            try {
                String line = br.readLine();
                if (line == null) {  
                    return false;
                }
                st = new StringTokenizer(line);
            } catch (IOException e) {
                return false;
            }
        }
        return true; 
    }
    
    String next(){
        while (st == null || !st.hasMoreElements()){
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e){
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }
    
    int nextInt() {
        return Integer.parseInt(next());
    }
    
    long nextLong() {
        return Long.parseLong(next());
    }
    
    double nextDouble() {
        return Double.parseDouble(next());
    }
    
    String nextLine() {
        String str = "";
        try {
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
    }
}

JAVA ac 代码:

import java.util.*;
import java.util.StringTokenizer;
import java.io.*;

public class Main {

	public static void main(String[] args) {
		int n=in.nextInt();
		int ans=0;
		while(n>0){
			ans+=n&1;//看n的最后一位是不是1
			n>>=1;//右移一位，把最后一位去掉
		}
		out.println(ans);
		out.close();
	}
	
	

	static FastReader in=new FastReader();
	static PrintWriter out=new PrintWriter(System.out);
	static class FastReader{
		static BufferedReader br;
		static StringTokenizer st;
		FastReader(){
			br=new BufferedReader(new InputStreamReader(System.in));
		}
		String next() {
			String str="";
			while(st==null||!st.hasMoreElements()) {
				try {
					str=br.readLine();
				}catch(IOException e) {
					throw new RuntimeException(e);
				}
				st=new StringTokenizer(str);
			}
			return st.nextToken();
		}
		int nextInt() {
			return Integer.parseInt(next());
		}
		double nextDouble() {
			return Double.parseDouble(next());
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	
}