#include<iostream>
using namespace std;
bool pingfang(long long x)
{
for(int i = 1;i * i <= x;i++)
{
if(i * i == x) return true;
}
return false;
}
long long he(long long y)
{
long long cnt = 0;
while(y != 0)
{
cnt += y % 10;
y /= 10;
}
return cnt;
}
int main()
{
long long n,m;
cin >> n >> m;
int cnt = 0;
for(long long i = n;i <= m;i++)
if(pingfang(he(i*i)))
{
if(he(i) * he(i) == he(i*i))
{
cnt++;
}
}
cout << cnt;
return 0;
}