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import java.util.Scanner;

public class row {

    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        final long k = sc.nextLong();
        final long a = sc.nextLong();
        final long b = sc.nextLong();

        int res = 0;
        for (long i = (a-1)/k*k+k; i <= b; i+=k) {
            if(k*sum(i) == i) {
                res++;
            }
        }
        System.out.println(res);
    }

    private static long sum(long i) {
        long res = 0;
        while(i>0) {
            res += i%10 * (i%10);
            i/=10;
        }
        return res;
    }

}