#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
long long  l,r,num=0;
long long work(long long a)
{
	int sum=0;
	while(a>0)
	{
		sum+=(a%10);
		a/=10;
	}
	return sum;
}
int main()
{
	freopen("rabbits.in","r",stdin);
	freopen("rabbits.out","w",stdout);
	cin>>l>>r;
	for(long long i=l;i<=r;i++)
	{ long long ii=i*i;
	if(work(i)*work(i)==work(i*i))
		num++;
		}
	cout<<num;
	return 0;
}