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
#include <iostream>
#include <cmath>

using namespace std;

typedef unsigned long long int ull;

int costam(ull n) {
  int result = 0;

  while (n) {
    int tmp = n%10;
    result += tmp*tmp;
    n/=10;
  }
  return result;
}

int main() {
  ull a, b, k;
  cin >> k >> a >> b;

  int result = 0;

  for (int i = 1; i <= 1500; ++i) {
    if (k*i >= a && k*i <= b && costam(i*k)*k == i*k) {
      result++;
    }
  }

  cout << result << endl;

  return 0;
}