UVA 11461 Java

import java.util.*;
 
public class main{
  public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    while(sc.hasNextInt())
    {
    	int num1 = sc.nextInt();
    	int num2 = sc.nextInt();
    	if(num1 == num2 && num1 == 0)
    		break;
		int count = (int)Math.sqrt(num2) - (int)Math.ceil(Math.sqrt(num1)) + 1;
    	System.out.println(count);
    }
  }
};