Java实现****************************************************

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner scanner=new Scanner(System.in);

int a=scanner.nextInt();

int b=scanner.nextInt();

int count=0;

for(int i=a;i<=b;i++)

{

int j=i;

while(j!=0)

{

if(j%2==1) count++;

j=j/2;

}

}

System.out.println(count);

}

}