Free Goods

Hi all

I have a unique requirement for free goods.

Currently we are using inclusive free goods i.e. buy 3 get 1 free with a minimum quantity to be bought is 3.

Thus if the customer orders 6 he gets billed only for 4 (i.e. 2 are free)

But the business now wants to give only 1 free if the minimum order quantity is 3 or more.

So if the customer buys 3 free he gets billed for 2 (i.e. 1 is free). Also if he buys any quantity more than 3, he gets only 1 free. e.g. he buys 6, he gets billed for 5.

Is there a way to do it without developing a custom calculation routine for free goods ?

Thanks in advance

vin