long checkmin(long a, long b, long c, long d)
{
  if (a-1 > a)
    goto min;
  if (b-1 > b)
    goto min;
  if (c-1 > c)
    goto min;
  if (d-1 > d)
    goto min;
  return a+b+c+d;
 min:
  return a*b*c*d;
}