float *p;

float
f(float f)
{
 static float a[3];
 float q, r;

  q = a[0]/f;
  p[(int)q] = f;
  r = a[0];
  r *= a[1];
  r *= a[2];
  a[2] = a[1];
  a[1] = a[0];
  a[0] = f;
  return r+q;
}