#include <bits/stdc++.h>
using namespace std;
int main()
{
long long int n,m,i,b,count;
while(scanf("%lld %lld",&n,&m)==2)
{
if(n==0 && m==0) break;
count=0;
for(i=n;i<=m;i++)
{
b=sqrt(i);
if(i==(b*b))
count++;
}
cout<<count<<endl;
}
return 0;
}
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