There are 1 sticks with lengths of 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, and 8 cm. Choose a number of sticks to form a square. How many different ways are there in total?
有长度分别为1厘米，2厘米，3厘米，4厘米，5厘米，6厘米，7厘米，8厘米的木棍各1根，从中选出若干根组成正方形，共有多少种不同选法．
<result>3</result>