A company is planning its $4-$week winter advertising campaign. The marketing team is planning to mail one of the following different types of advertisements, at random, to their city's residents each week. They have the following types of advertisements ready to send:

Week $1$ Week $2$ Week $3$ Week $4$

Postcard Flyer Brochure Business card

Leaflet Catalog Poster Coupon

Calendar

How many different possible ways can a resident receive an advertisement in the mail?