Team Fortress 2 Crafting: How Many Items for a Hat?

How many items for a hat ? How to make a hat ? How to craft ? What do i need for it ?
I do some math.
For those who already don't know how many items to get a hat.

To clarify to some who don't get it:
To get a level 1 metal, you need to combine three of the same weapon.
To get a level 2 metal, you need to combine three of the level 1 metals.
To get a level 3 metal, you need to combine three of the level 2 metals.
To get a Token, you need to combine four of the same class items.

New Crafting System

To get a level 1 metal, you need to combine TWO of the same weapon.
To get a Token, you need to combine THREE of the same class items.