There are 120 points inside a rectangle, together with the 4 vertices of the rectangle, there are 124 points in total. Given that any three points are not on the same straight line, how many non-overlapping triangles have these points as vertices?
一个长方形内部有120个点，连同长方形的4个顶点，共有124个点．已知任意三点均不在同一直线上，以这些点为顶点而且互不重叠的三角形共有多少个．
<gadget id="calculator">120 - 1</gadget>
<output>119</output>

<gadget id="calculator">119 * 2</gadget>
<output>238</output>

<gadget id="calculator">238 + 4</gadget>
<output>242</output>

<result>242</result>