#30202: 好像有點冗 C++
#include<iostream>
using namespace std;
int main(){
int from = 0, end = 0;
while(1){
int j,count = 0;
cin >> from >> end;
if(from == 0 && end ==0){
break;
}
for(j = 1; j * j < from; j++);
for(; j * j <= end ; j++){
count++;
}
cout << count << endl;
}
return 0;
}