MinhMiw

include<bits/stdc++.h>

using namespace std;
long long n,x;
bool scp(long long m)
{
long long x=sqrt(m);
if(x*x==m) return true;
else return false;
}
main()
{
long long L,R,dem=0;
cin>>L>>R;
for (int i=L;i<=R;i++)
if (scp(i)) dem++;
cout<<dem;
}