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#include <iostream> 

const int m = 19 * 9 * 9;

int sum_kw(long long n) {
    int c =0;
    
    while (n != 0) {
       c +=  (n % 10)*(n % 10);
       n/=10;      
    }
    
    return c;
}


int main() {
  long long k;
  long long a,b;  
  
  std::cin >> k >> a >> b;
  
  int c = 0;
  
  for (int i = 1; i < m; i++) {
      if (k * i > b) break;
      if (k * i < a) continue;
      if (i ==sum_kw(k*i))  c++;
  }
   
  std::cout << c;
  
  return 0;    
}