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//#include <cstdio>
#include <iostream>
using namespace std;
long long f(long long n){
	long long suma=0;
	int tmp;
	while (n>0){
		tmp=n%10;
		tmp=tmp*tmp;
		suma=suma+tmp;
		n/=10;
	}
	return suma;
}
int main(){
	//printf("siema\n");
	ios_base::sync_with_stdio(0);
	long long licz=0;
	long long a,b, k;
	cin>>k>>a>>b;
	for (long long i=a; i<b; i++){
		if (i==f(i)*k){
			licz++;
			//printf(i, "%lld\n");
			//cout<<licz<<": "<<i<<endl;
		}
		
		//cout<<i<<": "<<f(i)<<endl;
	}
	cout<<licz;
	return 0;
}