#include<bits/stdc++.h>
using namespace std;


int main()
{
    double n,a,b,c,c1,d;
    int i,count;
    while(scanf("%lf %lf",&a,&b)==2)
    {
        count=0;
        if(a==0||b==0)
            break;
        for(i=a;i<=b;i++)
        {
           n=i;
           c=sqrt(n);
        //   cout<<c<<endl;
           c1=floor(sqrt(n));
        //   cout<<c1<<endl;
           if((c-c1)==0)
            count++;
        }
        cout<<count<<endl;
    }
    return 0;
}