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//============================================================================
// Name        : row.cpp
// Author      : Piotr
// Version     :
// Copyright   : Your copyright notice
// Description : Hello World in C++, Ansi-style
//============================================================================

#include <iostream>

using namespace std;

int f(unsigned long long);
int main() {
	unsigned long long k, a ,b;
	cin >> k;
	cin >> a;
	cin >> b;
//	cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
//	cout << (k^2) << " " << a << " " << b << endl;
//	cout << f(7293) << endl;
	int wynik = 0 ;

	for(unsigned long long i = 1; i < 1500; i++) {
		if(k*i > b) break;
		if( k*i >=a)
			if( f(k*i) == i ) wynik++;
	}

	cout << wynik <<endl;
	return 0;
}
int f(unsigned long long n){
	int f=0;
//	cout << n%10 << " " << n/10 <<" " << (n/10)%10 <<endl;
	int cyfra;
	while (n > 0) {
		cyfra = n%10;
		f += cyfra*cyfra;
		n = n/10;

	}
	return f;
}