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#include <iostream>

using namespace std;

typedef long long li;

li k,a,b;

li f(li n)
{
	int x;
	li res = 0;
	while(n > 0)
	{
		x = n%10;
		res += x*x;
		n /= 10;
	}
	return res;
}


int main()
{	
	ios_base::sync_with_stdio(false);

	cin >> k >> a >> b;
	li res = 0;

	if( a%k != 0 )
	{
		a /= k;
		a *= k;
		a += k;
	}


	while( a <= b )
	{
		//cout << "a = " << a << endl;
		if( f(a) == a/k )
		{
			res++;
			//cout << a << " is ok " << endl;
		}	
		a += k;
	}

	cout << res << endl;

	return 0;
}