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//Tomasz Czarkowski
#include<iostream>
using namespace std;
int sumakwadr(int n){
	int m=1;
	int n1=n;
	int c=0;
	while(n1){
		m=n1-((n1/10)*10);
		c+=m*m;
		n1=n1/10;
	}
	return c;
}
main(){
	long long n=0,k,a,b,d=0;
	cin>>k>>a>>b;
	n=a;
	while(n<=b){
		if(k*sumakwadr(n)==n){
			d++;
		}
		n++;
	}
	cout<<d;
}