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#include <stdio.h>
#include <string.h>
#include <math.h>

int main () {
  unsigned long long k, a, b, i, j;
  int suma = 0;
  char str_j[32];
  unsigned long long suma_kwadratow = 0;
  scanf ("%llu %llu %llu", &k, &a, &b);
  for (i = a; i <= b; i++) {
    sprintf (str_j, "%llu", i);
    suma_kwadratow = 0;
    for (j = 0; j < strlen (str_j); j++)
      suma_kwadratow += pow (str_j[j] - 48, 2);
    if (k * suma_kwadratow == i)
      suma++;}
  printf ("%i\n", suma);
  return 0;}