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#include <iostream>
using namespace std;

int sumSquares(long long n){
	int sum = 0;
	
	while(n > 0){
		int digit = n % 10;
		n /= 10;
		sum += digit * digit;
	}
	
	return sum;
}

int main(){
	long long k, a, b, n;
	int limit = 19 * 81;
	int count = 0;
	
	cin >> k >> a >> b;
	
	for(int i=1; i<=limit; i++){
		n = i * k;
		
		if(n > b || n < 0) break;
		
		if(n >= a && n <= b && k * sumSquares(n) == n){
			count++;
			//cout << n << endl;
		}
	}
	
	cout << count << endl;
	
	return 0;
}