/* gcc -O2 -Wall sched.c -o sched -lm */

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

#define ITERATIONS 1000000

int
main ()
{
  double i = 1.0;
  double n = 2;
  int c = 2;

  while (n < ITERATIONS) {
    i = n;
    while (i > 1) {
      if (fmod (i, 2) == 0)
	i /= 2;
      else
	i = 3*i+1;
    }
    n++;
    c++;
  }

  if (c < ITERATIONS) {
    fprintf (stderr, "\nERROR: exited early c = %d (i = %g, n = %g)\n",
	     c, i, n);
    exit (1);
  }

  exit (0);
}