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#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <utility>
#define ll long long
#define ld long double

using namespace std;

ll f(ll n)
{
	ll s = 0;
	
	while(n > 0)
	{
		s = s + (n % 10) * (n % 10);
		n = n / 10;
	}
	
	return s;
}

int main()
{
	ll A, B, K;
	cin >> K >> A >> B;
	
	ll l = 0;
	
	for(ll i = 1; i <= 18 * 81; i++)
	{
		if((A / i) <= K && K <= B / i)
		{
			if(f(K * i) == i)
				l++;
		}
	}
	
	cout << l << endl;
	
	return 0;
}