There are a batch of thin wooden strips with lengths of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 centimeters, and there are enough of them, and 3 wooden strips are appropriately selected as the three sides. How many different triangles are formed.
有一批长度分别为1、2、3、4、5、6、7、8、9、10和11厘米的细木条，它们的数量都足够多，从中适当选取3根木条作为三条边，可能围成多少个不同的三角形．
<gadget id="calculator">11 + 9 + 7 + 5 + 3 + 1 + 10 + 8 + 6 + 4 + 2 + 9 + 7 + 5 + 3 + 1 + 8 + 6 + 4 + 2 + 7 + 5 + 3 + 1 + 6 + 4 + 2 + 5 + 3 + 1 + 4 + 2 + 3 + 1 + 2 + 1</gadget>
<output>161</output>

<result>161</result>