Type A is a square with side length 2, Type B is a square with side length 1, and Type C is a rectangle with length and width 4 and 1, respectively. If there is 1 piece of paper of type A and 4 pieces of paper of type B, at least how many pieces of paper of type C should be taken before they can be used to form a new square.
甲类纸片是边长为2的正方形，乙类纸片是边长为1的正方形，丙类纸片是长、宽分别为4和1的长方形．现有甲类纸片1张，乙类纸片4张，则应至少取丙类纸片多少张，才能用它们拼成一个新的正方形．
<result>2</result>