1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
#include <cstdio>

long long log10(long long x)
{
	long long l = 1;

	while(x >= 10)
	{
		x /= 10;
		++l;
	}

	return l;
}

bool ok(long long n, long long k)
{
	long long x = n, y = 0;

	while(x > 0) {
		long long z = x % 10;
		x /= 10;
		y += z * z;
	}

	return k * y == n;
}

int main()
{
	long long k, a, b;

	scanf("%lld%lld%lld", &k, &a, &b);

	if(a % k != 0)
		a += k - (a % k);

	while(true)
	{
		long long l = log10(b);
		long long c = k * l * 9 * 9;

		if(b > c)
			b = c;
		else
			break;
	}

	long long w = 0;

	for(long long i = a; i <= b; i += k)
		if(ok(i, k))
			++w;

	printf("%lld\n", w);

	return 0;
}