阅读以下内容，回答题。
MEMORANDUM
TO: Marketing staff
FROM: Jonathan Blair
DATE: August 22
RE: New Advertising Campaign
We are very excited about our new line of infant clothes this year. The following will give you a general outline of the marketing strategies we have planned to help promote our new clothes. As you all know, this is our first attempt in this market, and we are anticipating great results. And to add to this, we have put together our biggest and most expensive ad campaign in several of the country' s largest media.

TELEVISl0N SPOTS	A thirty-second commercial on 3 0f the largest networks during primetime hours(7-9 p．m．)for three months．A total of 4 showings on each station daily．Als0 5 showings between 9-1 1 p．m．on Saturdays and 6 showings on Sundays．
NEWSPAPER ADD INS	Will feature a three-page advertisement complete with color—ful illustrations and discount coupons．Will be inserted into the middle of all major newspapers in the city on weekend editions for two months．
SUBWAY AND BUS ADS	Advertising posters on major routes around the city．A total of 5000 posters will be posted for l month．

Everyone is encouraged to submit comments and ideas to the Marketing Department.
What is the main purpose for the memorandum?