Peggy buys 3 folders, one each in the colors red, green, and blue.  She puts ten sheets of paper in each folder, and then, she puts star-shaped stickers on each sheet of paper.  In the red folder, each sheet of paper gets 3 stickers.  In the green folder, each sheet of paper gets 2 stickers, and in the blue folder, each sheet gets 1 sticker.  What is the total number of stickers Peggy uses?
Solve this problem.