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import java.util.Scanner;


public class row {

	public static final long maxSum=18*9*9;
	public static void main(String[] args) {

		// wczytaj dane
		long a,b,k;
		Scanner in=new Scanner(System.in);	
		k=in.nextLong();
		a=in.nextLong();
		b=in.nextLong();
//		System.out.println(18*9*9);
//		System.out.println(countSquaresSum(999999999999999999L));
		System.out.println(solution(k,a,b));
		in.close();

	}
	
	static int countSquaresSum(long number){
		int sum=0;
		while(number!=0){
			int digit=(int)(number%10);
			sum+=digit*digit;
			number/=10;
		}
		return sum;
	}

	private static long solution(long k, long a, long b) {
		// k za duze, dosun a
		if(k>a)
			a=k;
		if(a>b)
			return 0;
		int counter=0;
		int i=1;
		while(k*i<a && i<=maxSum){
			i++;
		}
		while(k*i>=a && k*i<=b && i<=maxSum){
			if(countSquaresSum(k*i)==i){
				counter++;
//				System.out.println(k*i+","+i);
			}
			i++;
		}
		
		return counter;
	}

}