Jeanette made a 3-by-3 square from tiles. She counted 9 tiles. She noticed that the one middle tile shared sides with 4 other tiles. She also noticed that each of the corner tiles of the big square shared sides with exactly 2 other tiles. Finally, she noticed that each of the middle tiles along the sides of the big square shared sides with exactly 3 other tiles. If Jeanette makes a 6-by-6 square from tiles, how many tiles will share sides with exactly 3 other tiles?