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#include <iostream>

using namespace std;

int row(long long n){
	int suma = 0;
	while (n!=0){
		suma = suma + (n%10)*(n%10);
		n = n/10;
	}
	return suma;
}


int main(){
	long long k, a, b;
	int w = 0;
	
	cin >> k >> a >> b;
	
	for (int i = a; i <= b; i++){
		if(k*row(i) == i){
		 w++;
		}
	}
	
	cout << w;
	
	return 0;
}