int main(int argc, char* argv[])
{
  int i, count=0;
  double f, sum=0.0, prod=1.0, resum=0.0;

  for (i=1; i<argc; ++i) {
    f = atof(argv[i]);
    count++;
    sum += f;
    prod *= f;
    resum += (1.0/f);
  }
  
  printf(,sum/count);
  printf(,pow(prod,(1.0/count)));
  printf(,count/resum);

  return 0;
}