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/*
 * runda_probna.cpp
 *
 *  Created on: 23 wrz 2015
 *      Author: Kamil
 */
#include<iostream>
using namespace std;

long long get_sum_of_digit_squares(long long iter)
{
	long long sum = 0;
	long long temp;
	while(iter > 0)
	{
		temp = iter % 10;
		sum += temp*temp;
		iter /= 10;
	}
	return sum;
}

int main()
{
	long long k, a, b;
	cin>>k>>a>>b;
	long long upper_bound = 1458;
	long long overflow_check = 1000000000000000LL;
	long long res = 0;
	long long iter = b;
	iter -= iter % k;
	if(k < overflow_check){
		if(iter > k*upper_bound)
			iter = k*upper_bound;
	}
	while(iter >= a)
	{
		if(iter/k == get_sum_of_digit_squares(iter) )
		{
			res++;
		}
		iter -= k;
	}
	cout<<res<<endl;
	return 0;
}