Need help with Range (Chains of Ice)

[Speedboy]

Need help with the Range from the cast Chains of Ice
Can i write the castrange with the second example?
With the first example he spams and spams

First esample 30 yd
else if ((Target.Distance < 30 && CanCast("Chains of Ice")))
{
Cast("Chains of Ice");


Second esample
else if ((Target.Distance < 25 - 30 && CanCast("Chains of Ice")))
{
Cast("Chains of Ice");

Is the secon example possible or not??? I need one wo Spams Chains of Ice in the Distance 25-30yd

Thanks for Infos ,sorry for my englisch