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#include <iostream>
#include <cstdio>
using namespace std;

long long int k, a, b;
int wynik;

int f(long long int n) {
	int ret = 0;
	
	while(n>0) {
		ret = ret + (n%10)*(n%10);
		n = n/10;
	}
	return ret;
}

int main() {
	ios_base::sync_with_stdio(0);
	
	cin >> k >> a >> b;
	
	for(int i = 1; i <= 1600; i++) {
		if(k*i > b) break;
		if(k*i >= a) {
			if(i == f(k*i)) wynik++;
		}
	}
	
	cout << wynik;
	
	return 0;
}