Hairu loves to count. He counts his collection of stickers and make sure he does not lose the stickers. He also exchanges the stickers with his friends. At certain times, he can use 1 sticker to exchange 2 or 3 stickers with his friends because his friends like his stickers. As he collects more and more stickers, he needs to know and count to bigger numbers. He also gets to know addition, subtraction, multiplication and division of numbers.