public static SimpleSet operator *(SimpleSet a, SimpleSet b)
{
SimpleSet ans = new SimpleSet(Math.Min(a.MaxVal, b.MaxVal));
for (int i = 1; i <= Math.Min(a.MaxVal, b.MaxVal); i++)
{
if (a.CheckEl(i) && b.CheckEl(i))
{
ans.AddEl(i);
}
}
return(ans);
}