int ASSERT(int);

int b_main(int f) {
  int comf_level = 0;
  switch (f){
  case -10:
    comf_level = -100;
    break;
  case 0:
    comf_level = -90;
    break;
  case 10:
    comf_level = -50;
    break;
  case 20:
    comf_level = -10;
    break;
  case 30:
    comf_level = -10;
    break;
  case 40:
    comf_level = -5;
    break;
  case 50:
    comf_level = 0;
    break;
  case 60:
    comf_level = 10;
    break;
  case 70:
    comf_level = 20;
    break;
  case 80:
    comf_level = 30;
    break;
  case 90:
    comf_level = 0;
    break;
  case 100:
    comf_level = -10;
    break;
  case 110:
    comf_level = -100;
    break;
  default:
    comf_level = 100;
  }

  if (comf_level >= 0 && comf_level <= 20){
    ASSERT(f >= 50 );
    ASSERT(f <= 80);
  }

  return 1;
}

int main(void)
{
  int f;
  return b_main(f);
}
