题解 | #求int型正整数在内存中存储时1的个数#

//短除法，取模再整除

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        //短除法，取模再整除
        int out = 0;
        while(n>0){
            if(n%2==1){
                out++;
            }
            n = n/2;
        }
        System.out.println(out);
    }
}