Simple Crafting and Inventory System

Hi, is there any example scripts or such for a simple crafting and inventory system? Basically, if I were to pick up 6 logs and 2 flint, it would go in my inventory. Then I can do crafting, like 6 logs + 2 flint = Campfire. Any help? (If you have and example script, please tell me what to attach it to. #noob)