Christmas puzzle, anyone?

In Christmas Fantasy Land, each child has several gifts. The gifts are wrapped with wrappers of different colors. The color of the wrapper represents the value of the gift. The children can exchange gifts with each other, either singly or in a group, as long as the values of the gifts exchanged remains the same.

THESE GIFTS CAN	EXCHANGE FOR
YOU HAVE
	???

If you have a gift in a green wrapper, how many gifts in yellow wrapper can you exchange for?